微软官方SqlHelper类 数据库辅助操作类

数据库操作类真的没有必要自己去写，因为成熟的类库真的非常完善了，拿来直接用就好，省时省力。

本文就为大家介绍微软官方的程序PetShop4.0中的SqlHelper类，先来做一下简单的介绍，PetShop是一个范例，微软用它来展示.Net企业系统开发的能力。

那SqlHelper中封装了哪些方法呢？

里面的函数一堆，常用的就那几个，无非就是增删改查嘛，来看下几种常用的函数：

1.ExecuteNonQuery 执行增删改
2.ExecuteReader 执行查询
3.ExecuteScalar 返回首行首列

使用方法介绍

Web.config配置

<connectionStrings>    <add name="ConnectionString" connectionString="server=127.0.0.1;uid=sa;pwd=ok;database=PetShop;Max Pool Size =512; Min Pool Size=0; Connection Lifetime = 300;packet size=1000;" providerName="System.Data.SqlClient" /></connectionStrings>

调用函数的写法

sql = "UPDATE Student set Name = @Name WHERE Id = @Id";SqlHelper.ExecuteNonQuery(CommandType.Text, sql, new SqlParameter[]{ new SqlParameter("@Name", name), new SqlParameter("@Id", id)});

这样调用就比较简化，而且比较灵活

源码呈上

/// <summary>  /// The SqlHelper class is intended to encapsulate high performance,   /// scalable best practices for common uses of SqlClient.  /// </summary>  public abstract class SqlHelper  {     //数据库连接字符串    public static readonly string ConnectionString = ConfigurationManager.ConnectionStrings["SQLConnString"].ConnectionString;     #region 私有函数和方法     /// <summary>    /// This method is used to attach array of SqlParameters to a SqlCommand.    ///     /// This method will assign a value of DbNull to any parameter with a direction of    /// InputOutput and a value of null.     ///     /// This behavior will prevent default values from being used, but    /// this will be the less common case than an intended pure output parameter (derived as InputOutput)    /// where the user provided no input value.    /// </summary>    /// <param name="command">The command to which the parameters will be added</param>    /// <param name="commandParameters">An array of SqlParameters to be added to command</param>    private static void AttachParameters(SqlCommand command, SqlParameter[] commandParameters)    {      if (command == null) throw new ArgumentNullException("command");      if (commandParameters != null)      {        foreach (SqlParameter p in commandParameters)        {          if (p != null)          {            // Check for derived output value with no value assigned            if ((p.Direction == ParameterDirection.InputOutput ||              p.Direction == ParameterDirection.Input) &&              (p.Value == null))            {              p.Value = DBNull.Value;            }            command.Parameters.Add(p);          }        }      }    }     /// <summary>    /// This method assigns dataRow column values to an array of SqlParameters    /// </summary>    /// <param name="commandParameters">Array of SqlParameters to be assigned values</param>    /// <param name="dataRow">The dataRow used to hold the stored procedure's parameter values</param>    private static void AssignParameterValues(SqlParameter[] commandParameters, DataRow dataRow)    {      if ((commandParameters == null) || (dataRow == null))      {        // Do nothing if we get no data        return;      }       int i = 0;      // Set the parameters values      foreach (SqlParameter commandParameter in commandParameters)      {        // Check the parameter name        if (commandParameter.ParameterName == null ||          commandParameter.ParameterName.Length <= 1)          throw new Exception(            string.Format(              "Please provide a valid parameter name on the parameter #{0}, the ParameterName property has the following value: '{1}'.",              i, commandParameter.ParameterName));        if (dataRow.Table.Columns.IndexOf(commandParameter.ParameterName.Substring(1)) != -1)          commandParameter.Value = dataRow[commandParameter.ParameterName.Substring(1)];        i++;      }    }     /// <summary>    /// This method assigns an array of values to an array of SqlParameters    /// </summary>    /// <param name="commandParameters">Array of SqlParameters to be assigned values</param>    /// <param name="parameterValues">Array of objects holding the values to be assigned</param>    private static void AssignParameterValues(SqlParameter[] commandParameters, object[] parameterValues)    {      if ((commandParameters == null) || (parameterValues == null))      {        // Do nothing if we get no data        return;      }       // We must have the same number of values as we pave parameters to put them in      if (commandParameters.Length != parameterValues.Length)      {        throw new ArgumentException("Parameter count does not match Parameter Value count.");      }       // Iterate through the SqlParameters, assigning the values from the corresponding position in the       // value array      for (int i = 0, j = commandParameters.Length; i < j; i++)      {        // If the current array value derives from IDbDataParameter, then assign its Value property        if (parameterValues[i] is IDbDataParameter)        {          IDbDataParameter paramInstance = (IDbDataParameter)parameterValues[i];          if (paramInstance.Value == null)          {            commandParameters[i].Value = DBNull.Value;          }          else          {            commandParameters[i].Value = paramInstance.Value;          }        }        else if (parameterValues[i] == null)        {          commandParameters[i].Value = DBNull.Value;        }        else        {          commandParameters[i].Value = parameterValues[i];        }      }    }     /// <summary>    /// This method opens (if necessary) and assigns a connection, transaction, command type and parameters     /// to the provided command    /// </summary>    /// <param name="command">The SqlCommand to be prepared</param>    /// <param name="connection">A valid SqlConnection, on which to execute this command</param>    /// <param name="transaction">A valid SqlTransaction, or 'null'</param>    /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>    /// <param name="commandText">The stored procedure name or T-SQL command</param>    /// <param name="commandParameters">An array of SqlParameters to be associated with the command or 'null' if no parameters are required</param>    /// <param name="mustCloseConnection"><c>true</c> if the connection was opened by the method, otherwose is false.</param>    private static void PrepareCommand(SqlCommand command, SqlConnection connection, SqlTransaction transaction, CommandType commandType, string commandText, SqlParameter[] commandParameters, out bool mustCloseConnection)    {      if (command == null) throw new ArgumentNullException("command");      if (commandText == null || commandText.Length == 0) throw new ArgumentNullException("commandText");       // If the provided connection is not open, we will open it      if (connection.State != ConnectionState.Open)      {        mustCloseConnection = true;        connection.Open();      }      else      {        mustCloseConnection = false;      }       // Associate the connection with the command      command.Connection = connection;       // Set the command text (stored procedure name or SQL statement)      command.CommandText = commandText;       // If we were provided a transaction, assign it      if (transaction != null)      {        if (transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");        command.Transaction = transaction;      }       // Set the command type      command.CommandType = commandType;       // Attach the command parameters if they are provided      if (commandParameters != null)      {        AttachParameters(command, commandParameters);      }      return;    }     #endregion private utility methods & constructors     #region ExecuteNonQuery     public static int ExecuteNonQuery(CommandType cmdType, string cmdText)    {      return ExecuteNonQuery(ConnectionString, cmdType, cmdText);    }     public static int ExecuteNonQuery(CommandType cmdType, string cmdText, params SqlParameter[] commandParameters)    {      return ExecuteNonQuery(ConnectionString, cmdType, cmdText, commandParameters);    }     /// <summary>    /// Execute a SqlCommand (that returns no resultset and takes no parameters) against the database specified in     /// the connection string    /// </summary>    /// <remarks>    /// e.g.:     /// int result = ExecuteNonQuery(connString, CommandType.StoredProcedure, "PublishOrders");    /// </remarks>    /// <param name="connectionString">A valid connection string for a SqlConnection</param>    /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>    /// <param name="commandText">The stored procedure name or T-SQL command</param>    /// <returns>An int representing the number of rows affected by the command</returns>    public static int ExecuteNonQuery(string connectionString, CommandType commandType, string commandText)    {      // Pass through the call providing null for the set of SqlParameters      return ExecuteNonQuery(connectionString, commandType, commandText, (SqlParameter[])null);    }     /// <summary>    /// Execute a SqlCommand (that returns no resultset) against the database specified in the connection string     /// using the provided parameters    /// </summary>    /// <remarks>    /// e.g.:     /// int result = ExecuteNonQuery(connString, CommandType.StoredProcedure, "PublishOrders", new SqlParameter("@prodid", 24));    /// </remarks>    /// <param name="connectionString">A valid connection string for a SqlConnection</param>    /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>    /// <param name="commandText">The stored procedure name or T-SQL command</param>    /// <param name="commandParameters">An array of SqlParamters used to execute the command</param>    /// <returns>An int representing the number of rows affected by the command</returns>    public static int ExecuteNonQuery(string connectionString, CommandType commandType, string commandText, params SqlParameter[] commandParameters)    {      if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");       // Create & open a SqlConnection, and dispose of it after we are done      using (SqlConnection connection = new SqlConnection(connectionString))      {        connection.Open();         // Call the overload that takes a connection in place of the connection string        return ExecuteNonQuery(connection, commandType, commandText, commandParameters);      }    }     /// <summary>    /// Execute a stored procedure via a SqlCommand (that returns no resultset) against the database specified in     /// the connection string using the provided parameter values. This method will query the database to discover the parameters for the     /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.    /// </summary>    /// <remarks>    /// This method provides no access to output parameters or the stored procedure's return value parameter.    ///     /// e.g.:     /// int result = ExecuteNonQuery(connString, "PublishOrders", 24, 36);    /// </remarks>    /// <param name="connectionString">A valid connection string for a SqlConnection</param>    /// <param name="spName">The name of the stored prcedure</param>    /// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>    /// <returns>An int representing the number of rows affected by the command</returns>    public static int ExecuteNonQuery(string connectionString, string spName, params object[] parameterValues)    {      if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");      if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");       // If we receive parameter values, we need to figure out where they go      if ((parameterValues != null) && (parameterValues.Length > 0))      {        // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)        SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connectionString, spName);         // Assign the provided values to these parameters based on parameter order        AssignParameterValues(commandParameters, parameterValues);         // Call the overload that takes an array of SqlParameters        return ExecuteNonQuery(connectionString, CommandType.StoredProcedure, spName, commandParameters);      }      else      {        // Otherwise we can just call the SP without params        return ExecuteNonQuery(connectionString, CommandType.StoredProcedure, spName);      }    }     /// <summary>    /// Execute a SqlCommand (that returns no resultset and takes no parameters) against the provided SqlConnection.     /// </summary>    /// <remarks>    /// e.g.:     /// int result = ExecuteNonQuery(conn, CommandType.StoredProcedure, "PublishOrders");    /// </remarks>    /// <param name="connection">A valid SqlConnection</param>    /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>    /// <param name="commandText">The stored procedure name or T-SQL command</param>    /// <returns>An int representing the number of rows affected by the command</returns>    public static int ExecuteNonQuery(SqlConnection connection, CommandType commandType, string commandText)    {      // Pass through the call providing null for the set of SqlParameters      return ExecuteNonQuery(connection, commandType, commandText, (SqlParameter[])null);    }     /// <summary>    /// Execute a SqlCommand (that returns no resultset) against the specified SqlConnection     /// using the provided parameters.    /// </summary>    /// <remarks>    /// e.g.:     /// int result = ExecuteNonQuery(conn, CommandType.StoredProcedure, "PublishOrders", new SqlParameter("@prodid", 24));    /// </remarks>    /// <param name="connection">A valid SqlConnection</param>    /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>    /// <param name="commandText">The stored procedure name or T-SQL command</param>    /// <param name="commandParameters">An array of SqlParamters used to execute the command</param>    /// <returns>An int representing the number of rows affected by the command</returns>    public static int ExecuteNonQuery(SqlConnection connection, CommandType commandType, string commandText, params SqlParameter[] commandParameters)    {      if (connection == null) throw new ArgumentNullException("connection");       // Create a command and prepare it for execution      SqlCommand cmd = new SqlCommand();      bool mustCloseConnection = false;      PrepareCommand(cmd, connection, (SqlTransaction)null, commandType, commandText, commandParameters, out mustCloseConnection);       // Finally, execute the command      int retval = cmd.ExecuteNonQuery();       // Detach the SqlParameters from the command object, so they can be used again      cmd.Parameters.Clear();      if (mustCloseConnection)        connection.Close();      return retval;    }     /// <summary>    /// Execute a stored procedure via a SqlCommand (that returns no resultset) against the specified SqlConnection     /// using the provided parameter values. This method will query the database to discover the parameters for the     /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.    /// </summary>    /// <remarks>    /// This method provides no access to output parameters or the stored procedure's return value parameter.    ///     /// e.g.:     /// int result = ExecuteNonQuery(conn, "PublishOrders", 24, 36);    /// </remarks>    /// <param name="connection">A valid SqlConnection</param>    /// <param name="spName">The name of the stored procedure</param>    /// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>    /// <returns>An int representing the number of rows affected by the command</returns>    public static int ExecuteNonQuery(SqlConnection connection, string spName, params object[] parameterValues)    {      if (connection == null) throw new ArgumentNullException("connection");      if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");       // If we receive parameter values, we need to figure out where they go      if ((parameterValues != null) && (parameterValues.Length > 0))      {        // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)        SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);         // Assign the provided values to these parameters based on parameter order        AssignParameterValues(commandParameters, parameterValues);<b style="color:transparent">（、本文来源gao@!dai!ma.com搞$$代^@码网*</b><i>搞gaodaima代码</i>         // Call the overload that takes an array of SqlParameters        return ExecuteNonQuery(connection, CommandType.StoredProcedure, spName, commandParameters);      }      else      {        // Otherwise we can just call the SP without params        return ExecuteNonQuery(connection, CommandType.StoredProcedure, spName);      }    }     /// <summary>    /// Execute a SqlCommand (that returns no resultset and takes no parameters) against the provided SqlTransaction.     /// </summary>    /// <remarks>    /// e.g.:     /// int result = ExecuteNonQuery(trans, CommandType.StoredProcedure, "PublishOrders");    /// </remarks>    /// <param name="transaction">A valid SqlTransaction</param>    /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>    /// <param name="commandText">The stored procedure name or T-SQL command</param>    /// <returns>An int representing the number of rows affected by the command</returns>    public static int ExecuteNonQuery(SqlTransaction transaction, CommandType commandType, string commandText)    {      // Pass through the call providing null for the set of SqlParameters      return ExecuteNonQuery(transaction, commandType, commandText, (SqlParameter[])null);    }     /// <summary>    /// Execute a SqlCommand (that returns no resultset) against the specified SqlTransaction    /// using the provided parameters.    /// </summary>    /// <remarks>    /// e.g.:     /// int result = ExecuteNonQuery(trans, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24));    /// </remarks>    /// <param name="transaction">A valid SqlTransaction</param>    /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>    /// <param name="commandText">The stored procedure name or T-SQL command</param>    /// <param name="commandParameters">An array of SqlParamters used to execute the command</param>    /// <returns>An int representing the number of rows affected by the command</returns>    public static int ExecuteNonQuery(SqlTransaction transaction, CommandType commandType, string commandText, params SqlParameter[] commandParameters)    {      if (transaction == null) throw new ArgumentNullException("transaction");      if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");       // Create a command and prepare it for execution      SqlCommand cmd = new SqlCommand();      bool mustCloseConnection = false;      PrepareCommand(cmd, transaction.Connection, transaction, commandType, commandText, commandParameters, out mustCloseConnection);       // Finally, execute the command      int retval = cmd.ExecuteNonQuery();       // Detach the SqlParameters from the command object, so they can be used again      cmd.Parameters.Clear();      return retval;    }     /// <summary>    /// Execute a stored procedure via a SqlCommand (that returns no resultset) against the specified     /// SqlTransaction using the provided parameter values. This method will query the database to discover the parameters for the     /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.    /// </summary>    /// <remarks>    /// This method provides no access to output parameters or the stored procedure's return value parameter.    ///     /// e.g.:     /// int result = ExecuteNonQuery(conn, trans, "PublishOrders", 24, 36);    /// </remarks>    /// <param name="transaction">A valid SqlTransaction</param>    /// <param name="spName">The name of the stored procedure</param>    /// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>    /// <returns>An int representing the number of rows affected by the command</returns>    public static int ExecuteNonQuery(SqlTransaction transaction, string spName, params object[] parameterValues)    {      if (transaction == null) throw new ArgumentNullException("transaction");      if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");      if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");       // If we receive parameter values, we need to figure out where they go      if ((parameterValues != null) && (parameterValues.Length > 0))      {        // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)        SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);         // Assign the provided values to these parameters based on parameter order        AssignParameterValues(commandParameters, parameterValues);         // Call the overload that takes an array of SqlParameters        return ExecuteNonQuery(transaction, CommandType.StoredProcedure, spName, commandParameters);      }      else      {        // Otherwise we can just call the SP without params        return ExecuteNonQuery(transaction, CommandType.StoredProcedure, spName);      }    }     #endregion ExecuteNonQuery     #region ExecuteDataset     public static DataSet ExecuteDataset(CommandType commandType, string commandText)    {      return ExecuteDataset(ConnectionString, commandType, commandText);    }     public static DataSet ExecuteDataset(CommandType commandType, string commandText, params SqlParameter[] commandParameters)    {      return ExecuteDataset(ConnectionString, commandType, commandText, commandParameters);    }     /// <summary>    /// Execute a SqlCommand (that returns a resultset and takes no parameters) against the database specified in     /// the connection string.     /// </summary>    /// <remarks>    /// e.g.:     /// DataSet ds = ExecuteDataset(connString, CommandType.StoredProcedure, "GetOrders");    /// </remarks>    /// <param name="connectionString">A valid connection string for a SqlConnection</param>    /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>    /// <param name="commandText">The stored procedure name or T-SQL command</param>    /// <returns>A dataset containing the resultset generated by the command</returns>    public static DataSet ExecuteDataset(string connectionString, CommandType commandType, string commandText)    {      // Pass through the call providing null for the set of SqlParameters      return ExecuteDataset(connectionString, commandType, commandText, (SqlParameter[])null);    }     /// <summary>    /// Execute a SqlCommand (that returns a resultset) against the database specified in the connection string     /// using the provided parameters.    /// </summary>    /// <remarks>    /// e.g.:     /// DataSet ds = ExecuteDataset(connString, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24));    /// </remarks>    /// <param name="connectionString">A valid connection string for a SqlConnection</param>    /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>    /// <param name="commandText">The stored procedure name or T-SQL command</param>    /// <param name="commandParameters">An array of SqlParamters used to execute the command</param>    /// <returns>A dataset containing the resultset generated by the command</returns>    public static DataSet ExecuteDataset(string connectionString, CommandType commandType, string commandText, params SqlParameter[] commandParameters)    {      if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");       // Create & open a SqlConnection, and dispose of it after we are done      using (SqlConnection connection = new SqlConnection(connectionString))      {        connection.Open();         // Call the overload that takes a connection in place of the connection string        return ExecuteDataset(connection, commandType, commandText, commandParameters);      }    }     /// <summary>    /// Execute a stored procedure via a SqlCommand (that returns a resultset) against the database specified in     /// the connection string using the provided parameter values. This method will query the database to discover the parameters for the     /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.    /// </summary>    /// <remarks>    /// This method provides no access to output parameters or the stored procedure's return value parameter.    ///     /// e.g.:     /// DataSet ds = ExecuteDataset(connString, "GetOrders", 24, 36);    /// </remarks>    /// <param name="connectionString">A valid connection string for a SqlConnection</param>    /// <param name="spName">The name of the stored procedure</param>    /// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>    /// <returns>A dataset containing the resultset generated by the command</returns>    public static DataSet ExecuteDataset(string connectionString, string spName, params object[] parameterValues)    {      if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");      if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");       // If we receive parameter values, we need to figure out where they go      if ((parameterValues != null) && (parameterValues.Length > 0))      {        // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)        SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connectionString, spName);         // Assign the provided values to these parameters based on parameter order        AssignParameterValues(commandParameters, parameterValues);         // Call the overload that takes an array of SqlParameters        return ExecuteDataset(connectionString, CommandType.StoredProcedure, spName, commandParameters);      }      else      {        // Otherwise we can just call the SP without params        return ExecuteDataset(connectionString, CommandType.StoredProcedure, spName);      }    }     /// <summary>    /// Execute a SqlCommand (that returns a resultset and takes no parameters) against the provided SqlConnection.     /// </summary>    /// <remarks>    /// e.g.:     /// DataSet ds = ExecuteDataset(conn, CommandType.StoredProcedure, "GetOrders");    /// </remarks>    /// <param name="connection">A valid SqlConnection</param>    /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>    /// <param name="commandText">The stored procedure name or T-SQL command</param>    /// <returns>A dataset containing the resultset generated by the command</returns>    public static DataSet ExecuteDataset(SqlConnection connection, CommandType commandType, string commandText)    {      // Pass through the call providing null for the set of SqlParameters      return ExecuteDataset(connection, commandType, commandText, (SqlParameter[])null);    }     /// <summary>    /// Execute a SqlCommand (that returns a resultset) against the specified SqlConnection     /// using the provided parameters.    /// </summary>    /// <remarks>    /// e.g.:     /// DataSet ds = ExecuteDataset(conn, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24));    /// </remarks>    /// <param name="connection">A valid SqlConnection</param>    /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>    /// <param name="commandText">The stored procedure name or T-SQL command</param>    /// <param name="commandParameters">An array of SqlParamters used to execute the command</param>    /// <returns>A dataset containing the resultset generated by the command</returns>    public static DataSet ExecuteDataset(SqlConnection connection, CommandType commandType, string commandText, params SqlParameter[] commandParameters)    {      if (connection == null) throw new ArgumentNullException("connection");       // Create a command and prepare it for execution      SqlCommand cmd = new SqlCommand();      bool mustCloseConnection = false;      PrepareCommand(cmd, connection, (SqlTransaction)null, commandType, commandText, commandParameters, out mustCloseConnection);       // Create the DataAdapter & DataSet      using (SqlDataAdapter da = new SqlDataAdapter(cmd))      {        DataSet ds = new DataSet();         // Fill the DataSet using default values for DataTable names, etc        da.Fill(ds);         // Detach the SqlParameters from the command object, so they can be used again        cmd.Parameters.Clear();         if (mustCloseConnection)          connection.Close();         // Return the dataset        return ds;      }    }     /// <summary>    /// Execute a stored procedure via a SqlCommand (that returns a resultset) against the specified SqlConnection     /// using the provided parameter values. This method will query the database to discover the parameters for the     /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.    /// </summary>    /// <remarks>    /// This method provides no access to output parameters or the stored procedure's return value parameter.    ///     /// e.g.:     /// DataSet ds = ExecuteDataset(conn, "GetOrders", 24, 36);    /// </remarks>    /// <param name="connection">A valid SqlConnection</param>    /// <param name="spName">The name of the stored procedure</param>    /// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>    /// <returns>A dataset containing the resultset generated by the command</returns>    public static DataSet ExecuteDataset(SqlConnection connection, string spName, params object[] parameterValues)    {      if (connection == null) throw new ArgumentNullException("connection");      if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");       // If we receive parameter values, we need to figure out where they go      if ((parameterValues != null) && (parameterValues.Length > 0))      {        // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)        SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);         // Assign the provided values to these parameters based on parameter order        AssignParameterValues(commandParameters, parameterValues);         // Call the overload that takes an array of SqlParameters        return ExecuteDataset(connection, CommandType.StoredProcedure, spName, commandParameters);      }      else      {        // Otherwise we can just call the SP without params        return ExecuteDataset(connection, CommandType.StoredProcedure, spName);      }    }     /// <summary>    /// Execute a SqlCommand (that returns a resultset and takes no parameters) against the provided SqlTransaction.     /// </summary>    /// <remarks>    /// e.g.:     /// DataSet ds = ExecuteDataset(trans, CommandType.StoredProcedure, "GetOrders");    /// </remarks>    /// <param name="transaction">A valid SqlTransaction</param>    /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>    /// <param name="commandText">The stored procedure name or T-SQL command</param>    /// <returns>A dataset containing the resultset generated by the command</returns>    public static DataSet ExecuteDataset(SqlTransaction transaction, CommandType commandType, string commandText)    {      // Pass through the call providing null for the set of SqlParameters      return ExecuteDataset(transaction, commandType, commandText, (SqlParameter[])null);    }     /// <summary>    /// Execute a SqlCommand (that returns a resultset) against the specified SqlTransaction    /// using the provided parameters.    /// </summary>    /// <remarks>    /// e.g.:     /// DataSet ds = ExecuteDataset(trans, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24));    /// </remarks>    /// <param name="transaction">A valid SqlTransaction</param>    /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>    /// <param name="commandText">The stored procedure name or T-SQL command</param>    /// <param name="commandParameters">An array of SqlParamters used to execute the command</param>    /// <returns>A dataset containing the resultset generated by the command</returns>    public static DataSet ExecuteDataset(SqlTransaction transaction, CommandType commandType, string commandText, params SqlParameter[] commandParameters)    {      if (transaction == null) throw new ArgumentNullException("transaction");      if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");       // Create a command and prepare it for execution      SqlCommand cmd = new SqlCommand();      bool mustCloseConnection = false;      PrepareCommand(cmd, transaction.Connection, transaction, commandType, commandText, commandParameters, out mustCloseConnection);       // Create the DataAdapter & DataSet      using (SqlDataAdapter da = new SqlDataAdapter(cmd))      {        DataSet ds = new DataSet();         // Fill the DataSet using default values for DataTable names, etc        da.Fill(ds);         // Detach the SqlParameters from the command object, so they can be used again        cmd.Parameters.Clear();         // Return the dataset        return ds;      }    }     /// <summary>    /// Execute a stored procedure via a SqlCommand (that returns a resultset) against the specified     /// SqlTransaction using the provided parameter values. This method will query the database to discover the parameters for the     /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.    /// </summary>    /// <remarks>    /// This method provides no access to output parameters or the stored procedure's return value parameter.    ///     /// e.g.:     /// DataSet ds = ExecuteDataset(trans, "GetOrders", 24, 36);    /// </remarks>    /// <param name="transaction">A valid SqlTransaction</param>    /// <param name="spName">The name of the stored procedure</param>    /// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>    /// <returns>A dataset containing the resultset generated by the command</returns>    public static DataSet ExecuteDataset(SqlTransaction transaction, string spName, params object[] parameterValues)    {      if (transaction == null) throw new ArgumentNullException("transaction");      if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");      if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");       // If we receive parameter values, we need to figure out where they go      if ((parameterValues != null) && (parameterValues.Length > 0))      {        // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)        SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);         // Assign the provided values to these parameters based on parameter order        AssignParameterValues(commandParameters, parameterValues);         // Call the overload that takes an array of SqlParameters        return ExecuteDataset(transaction, CommandType.StoredProcedure, spName, commandParameters);      }      else      {        // Otherwise we can just call the SP without params        return ExecuteDataset(transaction, CommandType.StoredProcedure, spName);      }    }     #endregion ExecuteDataset     #region ExecuteReader     /// <summary>    /// This enum is used to indicate whether the connection was provided by the caller, or created by SqlHelper, so that    /// we can set the appropriate CommandBehavior when calling ExecuteReader()    /// </summary>    private enum SqlConnectionOwnership    {      /// <summary>Connection is owned and managed by SqlHelper</summary>      Internal,      /// <summary>Connection is owned and managed by the caller</summary>      External    }     public static SqlDataReader ExecuteReader(CommandType cmdType, string cmdText)    {      return ExecuteReader(ConnectionString, cmdType, cmdText);    }     public static SqlDataReader ExecuteReader(CommandType cmdType, string cmdText, params SqlParameter[] commandParameters)    {      return ExecuteReader(ConnectionString, cmdType, cmdText, commandParameters);    }     /// <summary>    /// Create and prepare a SqlCommand, and call ExecuteReader with the appropriate CommandBehavior.    /// </summary>    /// <remarks>    /// If we created and opened the connection, we want the connection to be closed when the DataReader is closed.    ///     /// If the caller provided the connection, we want to leave it to them to manage.    /// </remarks>    /// <param name="connection">A valid SqlConnection, on which to execute this command</param>    /// <param name="transaction">A valid SqlTransaction, or 'null'</param>    /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>    /// <param name="commandText">The stored procedure name or T-SQL command</param>    /// <param name="commandParameters">An array of SqlParameters to be associated with the command or 'null' if no parameters are required</param>    /// <param name="connectionOwnership">Indicates whether the connection parameter was provided by the caller, or created by SqlHelper</param>    /// <returns>SqlDataReader containing the results of the command</returns>    private static SqlDataReader ExecuteReader(SqlConnection connection, SqlTransaction transaction, CommandType commandType, string commandText, SqlParameter[] commandParameters, SqlConnectionOwnership connectionOwnership)    {      if (connection == null) throw new ArgumentNullException("connection");       bool mustCloseConnection = false;      // Create a command and prepare it for execution      SqlCommand cmd = new SqlCommand();      try      {        PrepareCommand(cmd, connection, transaction, commandType, commandText, commandParameters, out mustCloseConnection);         // Create a reader        SqlDataReader dataReader;         // Call ExecuteReader with the appropriate CommandBehavior        if (connectionOwnership == SqlConnectionOwnership.External)        {          dataReader = cmd.ExecuteReader();        }        else        {          dataReader = cmd.ExecuteReader(CommandBehavior.CloseConnection);        }         // Detach the SqlParameters from the command object, so they can be used again.        // HACK: There is a problem here, the output parameter values are fletched         // when the reader is closed, so if the parameters are detached from the command        // then the SqlReader can磘 set its values.         // When this happen, the parameters can磘 be used again in other command.        bool canClear = true;        foreach (SqlParameter commandParameter in cmd.Parameters)        {          if (commandParameter.Direction != ParameterDirection.Input)            canClear = false;        }         if (canClear)        {          cmd.Parameters.Clear();        }         return dataReader;      }      catch      {        if (mustCloseConnection)          connection.Close();        throw;      }    }     /// <summary>    /// Execute a SqlCommand (that returns a resultset and takes no parameters) against the database specified in     /// the connection string.     /// </summary>    /// <remarks>    /// e.g.:     /// SqlDataReader dr = ExecuteReader(connString, CommandType.StoredProcedure, "GetOrders");    /// </remarks>    /// <param name="connectionString">A valid connection string for a SqlConnection</param>    /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>    /// <param name="commandText">The stored procedure name or T-SQL command</param>    /// <returns>A SqlDataReader containing the resultset generated by the command</returns>    public static SqlDataReader ExecuteReader(string connectionString, CommandType commandType, string commandText)    {      // Pass through the call providing null for the set of SqlParameters      return ExecuteReader(connectionString, commandType, commandText, (SqlParameter[])null);    }     /// <summary>    /// Execute a SqlCommand (that returns a resultset) against the database specified in the connection string     /// using the provided parameters.    /// </summary>    /// <remarks>    /// e.g.:     /// SqlDataReader dr = ExecuteReader(connString, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24));    /// </remarks>    /// <param name="connectionString">A valid connection string for a SqlConnection</param>    /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>    /// <param name="commandText">The stored procedure name or T-SQL command</param>    /// <param name="commandParameters">An array of SqlParamters used to execute the command</param>    /// <returns>A SqlDataReader containing the resultset generated by the command</returns>    public static SqlDataReader ExecuteReader(string connectionString, CommandType commandType, string commandText, params SqlParameter[] commandParameters)    {      if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");      SqlConnection connection = null;      try      {        connection = new SqlConnection(connectionString);        connection.Open();         // Call the private overload that takes an internally owned connection in place of the connection string        return ExecuteReader(connection, null, commandType, commandText, commandParameters, SqlConnectionOwnership.Internal);      }      catch      {        // If we fail to return the SqlDatReader, we need to close the connection ourselves        if (connection != null) connection.Close();        throw;      }     }     /// <summary>    /// Execute a stored procedure via a SqlCommand (that returns a resultset) against the database specified in     /// the connection string using the provided parameter values. This method will query the database to discover the parameters for the     /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.    /// </summary>    /// <remarks>    /// This method provides no access to output parameters or the stored procedure's return value parameter.    ///     /// e.g.:     /// SqlDataReader dr = ExecuteReader(connString, "GetOrders", 24, 36);    /// </remarks>    /// <param name="connectionString">A valid connection string for a SqlConnection</param>    /// <param name="spName">The name of the stored procedure</param>    /// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>    /// <returns>A SqlDataReader containing the resultset generated by the command</returns>    public static SqlDataReader ExecuteReader(string connectionString, string spName, params object[] parameterValues)    {      if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");      if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");       // If we receive parameter values, we need to figure out where they go      if ((parameterValues != null) && (parameterValues.Length > 0))      {        SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connectionString, spName);         AssignParameterValues(commandParameters, parameterValues);         return ExecuteReader(connectionString, CommandType.StoredProcedure, spName, commandParameters);      }      else      {        // Otherwise we can just call the SP without params        return ExecuteReader(connectionString, CommandType.StoredProcedure, spName);      }    }     /// <summary>    /// Execute a SqlCommand (that returns a resultset and takes no parameters) against the provided SqlConnection.     /// </summary>    /// <remarks>    /// e.g.:     /// SqlDataReader dr = ExecuteReader(conn, CommandType.StoredProcedure, "GetOrders");    /// </remarks>    /// <param name="connection">A valid SqlConnection</param>    /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>    /// <param name="commandText">The stored procedure name or T-SQL command</param>    /// <returns>A SqlDataReader containing the resultset generated by the command</returns>    public static SqlDataReader ExecuteReader(SqlConnection connection, CommandType commandType, string commandText)    {      // Pass through the call providing null for the set of SqlParameters      return ExecuteReader(connection, commandType, commandText, (SqlParameter[])null);    }     /// <summary>    /// Execute a SqlCommand (that returns a resultset) against the specified SqlConnection     /// using the provided parameters.    /// </summary>    /// <remarks>    /// e.g.:     /// SqlDataReader dr = ExecuteReader(conn, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24));    /// </remarks>    /// <param name="connection">A valid SqlConnection</param>    /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>    /// <param name="commandText">The stored procedure name or T-SQL command</param>    /// <param name="commandParameters">An array of SqlParamters used to execute the command</param>    /// <returns>A SqlDataReader containing the resultset generated by the command</returns>    public static SqlDataReader ExecuteReader(SqlConnection connection, CommandType commandType, string commandText, params SqlParameter[] commandParameters)    {      // Pass through the call to the private overload using a null transaction value and an externally owned connection      return ExecuteReader(connection, (SqlTransaction)null, commandType, commandText, commandParameters, SqlConnectionOwnership.External);    }     /// <summary>    /// Execute a stored procedure via a SqlCommand (that returns a resultset) against the specified SqlConnection     /// using the provided parameter values. This method will query the database to discover the parameters for the     /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.    /// </summary>    /// <remarks>    /// This method provides no access to output parameters or the stored procedure's return value parameter.    ///     /// e.g.:     /// SqlDataReader dr = ExecuteReader(conn, "GetOrders", 24, 36);    /// </remarks>    /// <param name="connection">A valid SqlConnection</param>    /// <param name="spName">The name of the stored procedure</param>    /// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>    /// <returns>A SqlDataReader containing the resultset generated by the command</returns>    public static SqlDataReader ExecuteReader(SqlConnection connection, string spName, params object[] parameterValues)    {      if (connection == null) throw new ArgumentNullException("connection");      if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");       // If we receive parameter values, we need to figure out where they go      if ((parameterValues != null) && (parameterValues.Length > 0))      {        SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);         AssignParameterValues(commandParameters, parameterValues);         return ExecuteReader(connection, CommandType.StoredProcedure, spName, commandParameters);      }      else      {        // Otherwise we can just call the SP without params        return ExecuteReader(connection, CommandType.StoredProcedure, spName);      }    }     /// <summary>    /// Execute a SqlCommand (that returns a resultset and takes no parameters) against the provided SqlTransaction.     /// </summary>    /// <remarks>    /// e.g.:     /// SqlDataReader dr = ExecuteReader(trans, CommandType.StoredProcedure, "GetOrders");    /// </remarks>    /// <param name="transaction">A valid SqlTransaction</param>    /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>    /// <param name="commandText">The stored procedure name or T-SQL command</param>    /// <returns>A SqlDataReader containing the resultset generated by the command</returns>    public static SqlDataReader ExecuteReader(SqlTransaction transaction, CommandType commandType, string commandText)    {      // Pass through the call providing null for the set of SqlParameters      return ExecuteReader(transaction, commandType, commandText, (SqlParameter[])null);    }     /// <summary>    /// Execute a SqlCommand (that returns a resultset) against the specified SqlTransaction    /// using the provided parameters.    /// </summary>    /// <remarks>    /// e.g.:     ///  SqlDataReader dr = ExecuteReader(trans, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24));    /// </remarks>    /// <param name="transaction">A valid SqlTransaction</param>    /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>    /// <param name="commandText">The stored procedure name or T-SQL command</param>    /// <param name="commandParameters">An array of SqlParamters used to execute the command</param>    /// <returns>A SqlDataReader containing the resultset generated by the command</returns>    public static SqlDataReader ExecuteReader(SqlTransaction transaction, CommandType commandType, string commandText, params SqlParameter[] commandParameters)    {      if (transaction == null) throw new ArgumentNullException("transaction");      if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");       // Pass through to private overload, indicating that the connection is owned by the caller      return ExecuteReader(transaction.Connection, transaction, commandType, commandText, commandParameters, SqlConnectionOwnership.External);    }     /// <summary>    /// Execute a stored procedure via a SqlCommand (that returns a resultset) against the specified    /// SqlTransaction using the provided parameter values. This method will query the database to discover the parameters for the     /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.    /// </summary>    /// <remarks>    /// This method provides no access to output parameters or the stored procedure's return value parameter.    ///     /// e.g.:     /// SqlDataReader dr = ExecuteReader(trans, "GetOrders", 24, 36);    /// </remarks>    /// <param name="transaction">A valid SqlTransaction</param>    /// <param name="spName">The name of the stored procedure</param>    /// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>    /// <returns>A SqlDataReader containing the resultset generated by the command</returns>    public static SqlDataReader ExecuteReader(SqlTransaction transaction, string spName, params object[] parameterValues)    {      if (transaction == null) throw new ArgumentNullException("transaction");      if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");      if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");       // If we receive parameter values, we need to figure out where they go      if ((parameterValues != null) && (parameterValues.Length > 0))      {        SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);         AssignParameterValues(commandParameters, parameterValues);         return ExecuteReader(transaction, CommandType.StoredProcedure, spName, commandParameters);      }      else      {        // Otherwise we can just call the SP without params        return ExecuteReader(transaction, CommandType.StoredProcedure, spName);      }    }     #endregion ExecuteReader     #region ExecuteScalar     public static object ExecuteScalar(CommandType cmdType, string cmdText)    {      return ExecuteScalar(ConnectionString, cmdType, cmdText);    }     public static object ExecuteScalar(CommandType cmdType, string cmdText, params SqlParameter[] commandParameters)    {      return ExecuteScalar(ConnectionString, cmdType, cmdText, commandParameters);    }     /// <summary>    /// Execute a SqlCommand (that returns a 1x1 resultset and takes no parameters) against the database specified in     /// the connection string.     /// </summary>    /// <remarks>    /// e.g.:     /// int orderCount = (int)ExecuteScalar(connString, CommandType.StoredProcedure, "GetOrderCount");    /// </remarks>    /// <param name="connectionString">A valid connection string for a SqlConnection</param>    /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>    /// <param name="commandText">The stored procedure name or T-SQL command</param>    /// <returns>An object containing the value in the 1x1 resultset generated by the command</returns>    public static object ExecuteScalar(string connectionString, CommandType commandType, string commandText)    {      // Pass through the call providing null for the set of SqlParameters      return ExecuteScalar(connectionString, commandType, commandText, (SqlParameter[])null);    }     /// <summary>    /// Execute a SqlCommand (that returns a 1x1 resultset) against the database specified in the connection string     /// using the provided parameters.    /// </summary>    /// <remarks>    /// e.g.:     /// int orderCount = (int)ExecuteScalar(connString, CommandType.StoredProcedure, "GetOrderCount", new SqlParameter("@prodid", 24));    /// </remarks>    /// <param name="connectionString">A valid connection string for a SqlConnection</param>    /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>    /// <param name="commandText">The stored procedure name or T-SQL command</param>    /// <param name="commandParameters">An array of SqlParamters used to execute the command</param>    /// <returns>An object containing the value in the 1x1 resultset generated by the command</returns>    public static object ExecuteScalar(string connectionString, CommandType commandType, string commandText, params SqlParameter[] commandParameters)    {      if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");      // Create & open a SqlConnection, and dispose of it after we are done      using (SqlConnection connection = new SqlConnection(connectionString))      {        connection.Open();         // Call the overload that takes a connection in place of the connection string        return ExecuteScalar(connection, commandType, commandText, commandParameters);      }    }     /// <summary>    /// Execute a stored procedure via a SqlCommand (that returns a 1x1 resultset) against the database specified in     /// the connection string using the provided parameter values. This method will query the database to discover the parameters for the     /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.    /// </summary>    /// <remarks>    /// This method provides no access to output parameters or the stored procedure's return value parameter.    ///     /// e.g.:     /// int orderCount = (int)ExecuteScalar(connString, "GetOrderCount", 24, 36);    /// </remarks>    /// <param name="connectionString">A valid connection string for a SqlConnection</param>    /// <param name="spName">The name of the stored procedure</param>    /// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>    /// <returns>An object containing the value in the 1x1 resultset generated by the command</returns>    public static object ExecuteScalar(string connectionString, string spName, params object[] parameterValues)    {      if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");      if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");       // If we receive parameter values, we need to figure out where they go      if ((parameterValues != null) && (parameterValues.Length > 0))      {        // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)        SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connectionString, spName);         // Assign the provided values to these parameters based on parameter order        AssignParameterValues(commandParameters, parameterValues);         // Call the overload that takes an array of SqlParameters        return ExecuteScalar(connectionString, CommandType.StoredProcedure, spName, commandParameters);      }      else      {        // Otherwise we can just call the SP without params        return ExecuteScalar(connectionString, CommandType.StoredProcedure, spName);      }    }     /// <summary>    /// Execute a SqlCommand (that returns a 1x1 resultset and takes no parameters) against the provided SqlConnection.     /// </summary>    /// <remarks>    /// e.g.:     /// int orderCount = (int)ExecuteScalar(conn, CommandType.StoredProcedure, "GetOrderCount");    /// </remarks>    /// <param name="connection">A valid SqlConnection</param>    /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>    /// <param name="commandText">The stored procedure name or T-SQL command</param>    /// <returns>An object containing the value in the 1x1 resultset generated by the command</returns>    public static object ExecuteScalar(SqlConnection connection, CommandType commandType, string commandText)    {      // Pass through the call providing null for the set of SqlParameters      return ExecuteScalar(connection, commandType, commandText, (SqlParameter[])null);    }     /// <summary>    /// Execute a SqlCommand (that returns a 1x1 resultset) against the specified SqlConnection     /// using the provided parameters.    /// </summary>    /// <remarks>    /// e.g.:     /// int orderCount = (int)ExecuteScalar(conn, CommandType.StoredProcedure, "GetOrderCount", new SqlParameter("@prodid", 24));    /// </remarks>    /// <param name="connection">A valid SqlConnection</param>    /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>    /// <param name="commandText">The stored procedure name or T-SQL command</param>    /// <param name="commandParameters">An array of SqlParamters used to execute the command</param>    /// <returns>An object containing the value in the 1x1 resultset generated by the command</returns>    public static object ExecuteScalar(SqlConnection connection, CommandType commandType, string commandText, params SqlParameter[] commandParameters)    {      if (connection == null) throw new ArgumentNullException("connection");       // Create a command and prepare it for execution      SqlCommand cmd = new SqlCommand();       bool mustCloseConnection = false;      PrepareCommand(cmd, connection, (SqlTransaction)null, commandType, commandText, commandParameters, out mustCloseConnection);       // Execute the command & return the results      object retval = cmd.ExecuteScalar();       // Detach the SqlParameters from the command object, so they can be used again      cmd.Parameters.Clear();       if (mustCloseConnection)        connection.Close();       return retval;    }     /// <summary>    /// Execute a stored procedure via a SqlCommand (that returns a 1x1 resultset) against the specified SqlConnection     /// using the provided parameter values. This method will query the database to discover the parameters for the     /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.    /// </summary>    /// <remarks>    /// This method provides no access to output parameters or the stored procedure's return value parameter.    ///     /// e.g.:     /// int orderCount = (int)ExecuteScalar(conn, "GetOrderCount", 24, 36);    /// </remarks>    /// <param name="connection">A valid SqlConnection</param>    /// <param name="spName">The name of the stored procedure</param>    /// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>    /// <returns>An object containing the value in the 1x1 resultset generated by the command</returns>    public static object ExecuteScalar(SqlConnection connection, string spName, params object[] parameterValues)    {      if (connection == null) throw new ArgumentNullException("connection");      if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");       // If we receive parameter values, we need to figure out where they go      if ((parameterValues != null) && (parameterValues.Length > 0))      {        // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)        SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);         // Assign the provided values to these parameters based on parameter order        AssignParameterValues(commandParameters, parameterValues);         // Call the overload that takes an array of SqlParameters        return ExecuteScalar(connection, CommandType.StoredProcedure, spName, commandParameters);      }      else      {        // Otherwise we can just call the SP without params        return ExecuteScalar(connection, CommandType.StoredProcedure, spName);      }    }     /// <summary>    /// Execute a SqlCommand (that returns a 1x1 resultset and takes no parameters) against the provided SqlTransaction.     /// </summary>    /// <remarks>    /// e.g.:     /// int orderCount = (int)ExecuteScalar(trans, CommandType.StoredProcedure, "GetOrderCount");    /// </remarks>    /// <param name="transaction">A valid SqlTransaction</param>    /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>    /// <param name="commandText">The stored procedure name or T-SQL command</param>    /// <returns>An object containing the value in the 1x1 resultset generated by the command</returns>    public static object ExecuteScalar(SqlTransaction transaction, CommandType commandType, string commandText)    {      // Pass through the call providing null for the set of SqlParameters      return ExecuteScalar(transaction, commandType, commandText, (SqlParameter[])null);    }     /// <summary>    /// Execute a SqlCommand (that returns a 1x1 resultset) against the specified SqlTransaction    /// using the provided parameters.    /// </summary>    /// <remarks>    /// e.g.:     /// int orderCount = (int)ExecuteScalar(trans, CommandType.StoredProcedure, "GetOrderCount", new SqlParameter("@prodid", 24));    /// </remarks>    /// <param name="transaction">A valid SqlTransaction</param>    /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>    /// <param name="commandText">The stored procedure name or T-SQL command</param>    /// <param name="commandParameters">An array of SqlParamters used to execute the command</param>    /// <returns>An object containing the value in the 1x1 resultset generated by the command</returns>    public static object ExecuteScalar(SqlTransaction transaction, CommandType commandType, string commandText, params SqlParameter[] commandParameters)    {      if (transaction == null) throw new ArgumentNullException("transaction");      if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");       // Create a command and prepare it for execution      SqlCommand cmd = new SqlCommand();      bool mustCloseConnection = false;      PrepareCommand(cmd, transaction.Connection, transaction, commandType, commandText, commandParameters, out mustCloseConnection);       // Execute the command & return the results      object retval = cmd.ExecuteScalar();       // Detach the SqlParameters from the command object, so they can be used again      cmd.Parameters.Clear();      return retval;    }     /// <summary>    /// Execute a stored procedure via a SqlCommand (that returns a 1x1 resultset) against the specified    /// SqlTransaction using the provided parameter values. This method will query the database to discover the parameters for the     /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.    /// </summary>    /// <remarks>    /// This method provides no access to output parameters or the stored procedure's return value parameter.    ///     /// e.g.:     /// int orderCount = (int)ExecuteScalar(trans, "GetOrderCount", 24, 36);    /// </remarks>    /// <param name="transaction">A valid SqlTransaction</param>    /// <param name="spName">The name of the stored procedure</param>    /// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>    /// <returns>An object containing the value in the 1x1 resultset generated by the command</returns>    public static object ExecuteScalar(SqlTransaction transaction, string spName, params object[] parameterValues)    {      if (transaction == null) throw new ArgumentNullException("transaction");      if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");      if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");       // If we receive parameter values, we need to figure out where they go      if ((parameterValues != null) && (parameterValues.Length > 0))      {        // PPull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)        SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);         // Assign the provided values to these parameters based on parameter order        AssignParameterValues(commandParameters, parameterValues);         // Call the overload that takes an array of SqlParameters        return ExecuteScalar(transaction, CommandType.StoredProcedure, spName, commandParameters);      }      else      {        // Otherwise we can just call the SP without params        return ExecuteScalar(transaction, CommandType.StoredProcedure, spName);      }    }     #endregion ExecuteScalar     #region ExecuteXmlReader     /// <summary>    /// Execute a SqlCommand (that returns a resultset and takes no parameters) against the provided SqlConnection.     /// </summary>    /// <remarks>    /// e.g.:     /// XmlReader r = ExecuteXmlReader(conn, CommandType.StoredProcedure, "GetOrders");    /// </remarks>    /// <param name="connection">A valid SqlConnection</param>    /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>    /// <param name="commandText">The stored procedure name or T-SQL command using "FOR XML AUTO"</param>    /// <returns>An XmlReader containing the resultset generated by the command</returns>    public static XmlReader ExecuteXmlReader(SqlConnection connection, CommandType commandType, string commandText)    {      // Pass through the call providing null for the set of SqlParameters      return ExecuteXmlReader(connection, commandType, commandText, (SqlParameter[])null);    }     /// <summary>    /// Execute a SqlCommand (that returns a resultset) against the specified SqlConnection     /// using the provided parameters.    /// </summary>    /// <remarks>    /// e.g.:     /// XmlReader r = ExecuteXmlReader(conn, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24));    /// </remarks>    /// <param name="connection">A valid SqlConnection</param>    /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>    /// <param name="commandText">The stored procedure name or T-SQL command using "FOR XML AUTO"</param>    /// <param name="commandParameters">An array of SqlParamters used to execute the command</param>    /// <returns>An XmlReader containing the resultset generated by the command</returns>    public static XmlReader ExecuteXmlReader(SqlConnection connection, CommandType commandType, string commandText, params SqlParameter[] commandParameters)    {      if (connection == null) throw new ArgumentNullException("connection");       bool mustCloseConnection = false;      // Create a command and prepare it for execution      SqlCommand cmd = new SqlCommand();      try      {        PrepareCommand(cmd, connection, (SqlTransaction)null, commandType, commandText, commandParameters, out mustCloseConnection);         // Create the DataAdapter & DataSet        XmlReader retval = cmd.ExecuteXmlReader();         // Detach the SqlParameters from the command object, so they can be used again        cmd.Parameters.Clear();         return retval;      }      catch      {        if (mustCloseConnection)          connection.Close();        throw;      }    }     /// <summary>    /// Execute a stored procedure via a SqlCommand (that returns a resultset) against the specified SqlConnection     /// using the provided parameter values. This method will query the database to discover the parameters for the     /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.    /// </summary>    /// <remarks>    /// This method provides no access to output parameters or the stored procedure's return value parameter.    ///     /// e.g.:     /// XmlReader r = ExecuteXmlReader(conn, "GetOrders", 24, 36);    /// </remarks>    /// <param name="connection">A valid SqlConnection</param>    /// <param name="spName">The name of the stored procedure using "FOR XML AUTO"</param>    /// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>    /// <returns>An XmlReader containing the resultset generated by the command</returns>    public static XmlReader ExecuteXmlReader(SqlConnection connection, string spName, params object[] parameterValues)    {      if (connection == null) throw new ArgumentNullException("connection");      if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");       // If we receive parameter values, we need to figure out where they go      if ((parameterValues != null) && (parameterValues.Length > 0))      {        // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)        SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);         // Assign the provided values to these parameters based on parameter order        AssignParameterValues(commandParameters, parameterValues);         // Call the overload that takes an array of SqlParameters        return ExecuteXmlReader(connection, CommandType.StoredProcedure, spName, commandParameters);      }      else      {        // Otherwise we can just call the SP without params        return ExecuteXmlReader(connection, CommandType.StoredProcedure, spName);      }    }     /// <summary>    /// Execute a SqlCommand (that returns a resultset and takes no parameters) against the provided SqlTransaction.     /// </summary>    /// <remarks>    /// e.g.:     /// XmlReader r = ExecuteXmlReader(trans, CommandType.StoredProcedure, "GetOrders");    /// </remarks>    /// <param name="transaction">A valid SqlTransaction</param>    /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>    /// <param name="commandText">The stored procedure name or T-SQL command using "FOR XML AUTO"</param>    /// <returns>An XmlReader containing the resultset generated by the command</returns>    public static XmlReader ExecuteXmlReader(SqlTransaction transaction, CommandType commandType, string commandText)    {      // Pass through the call providing null for the set of SqlParameters      return ExecuteXmlReader(transaction, commandType, commandText, (SqlParameter[])null);    }     /// <summary>    /// Execute a SqlCommand (that returns a resultset) against the specified SqlTransaction    /// using the provided parameters.    /// </summary>    /// <remarks>    /// e.g.:     /// XmlReader r = ExecuteXmlReader(trans, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24));    /// </remarks>    /// <param name="transaction">A valid SqlTransaction</param>    /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>    /// <param name="commandText">The stored procedure name or T-SQL command using "FOR XML AUTO"</param>    /// <param name="commandParameters">An array of SqlParamters used to execute the command</param>    /// <returns>An XmlReader containing the resultset generated by the command</returns>    public static XmlReader ExecuteXmlReader(SqlTransaction transaction, CommandType commandType, string commandText, params SqlParameter[] commandParameters)    {      if (transaction == null) throw new ArgumentNullException("transaction");      if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");       // Create a command and prepare it for execution      SqlCommand cmd = new SqlCommand();      bool mustCloseConnection = false;      PrepareCommand(cmd, transaction.Connection, transaction, commandType, commandText, commandParameters, out mustCloseConnection);       // Create the DataAdapter & DataSet      XmlReader retval = cmd.ExecuteXmlReader();       // Detach the SqlParameters from the command object, so they can be used again      cmd.Parameters.Clear();      return retval;    }     /// <summary>    /// Execute a stored procedure via a SqlCommand (that returns a resultset) against the specified     /// SqlTransaction using the provided parameter values. This method will query the database to discover the parameters for the     /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.    /// </summary>    /// <remarks>    /// This method provides no access to output parameters or the stored procedure's return value parameter.    ///     /// e.g.:     /// XmlReader r = ExecuteXmlReader(trans, "GetOrders", 24, 36);    /// </remarks>    /// <param name="transaction">A valid SqlTransaction</param>    /// <param name="spName">The name of the stored procedure</param>    /// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>    /// <returns>A dataset containing the resultset generated by the command</returns>    public static XmlReader ExecuteXmlReader(SqlTransaction transaction, string spName, params object[] parameterValues)    {      if (transaction == null) throw new ArgumentNullException("transaction");      if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");      if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");       // If we receive parameter values, we need to figure out where they go      if ((parameterValues != null) && (parameterValues.Length > 0))      {        // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)        SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);         // Assign the provided values to these parameters based on parameter order        AssignParameterValues(commandParameters, parameterValues);         // Call the overload that takes an array of SqlParameters        return ExecuteXmlReader(transaction, CommandType.StoredProcedure, spName, commandParameters);      }      else      {        // Otherwise we can just call the SP without params        return ExecuteXmlReader(transaction, CommandType.StoredProcedure, spName);      }    }     #endregion ExecuteXmlReader     #region FillDataset    /// <summary>    /// Execute a SqlCommand (that returns a resultset and takes no parameters) against the database specified in     /// the connection string.     /// </summary>    /// <remarks>    /// e.g.:     /// FillDataset(connString, CommandType.StoredProcedure, "GetOrders", ds, new string[] {"orders"});    /// </remarks>    /// <param name="connectionString">A valid connection string for a SqlConnection</param>    /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>    /// <param name="commandText">The stored procedure name or T-SQL command</param>    /// <param name="dataSet">A dataset wich will contain the resultset generated by the command</param>    /// <param name="tableNames">This array will be used to create table mappings allowing the DataTables to be referenced    /// by a user defined name (probably the actual table name)</param>    public static void FillDataset(string connectionString, CommandType commandType, string commandText, DataSet dataSet, string[] tableNames)    {      if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");      if (dataSet == null) throw new ArgumentNullException("dataSet");       // Create & open a SqlConnection, and dispose of it after we are done      using (SqlConnection connection = new SqlConnection(connectionString))      {        connection.Open();         // Call the overload that takes a connection in place of the connection string        FillDataset(connection, commandType, commandText, dataSet, tableNames);      }    }     /// <summary>    /// Execute a SqlCommand (that returns a resultset) against the database specified in the connection string     /// using the provided parameters.    /// </summary>    /// <remarks>    /// e.g.:     /// FillDataset(connString, CommandType.StoredProcedure, "GetOrders", ds, new string[] {"orders"}, new SqlParameter("@prodid", 24));    /// </remarks>    /// <param name="connectionString">A valid connection string for a SqlConnection</param>    /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>    /// <param name="commandText">The stored procedure name or T-SQL command</param>    /// <param name="commandParameters">An array of SqlParamters used to execute the command</param>    /// <param name="dataSet">A dataset wich will contain the resultset generated by the command</param>    /// <param name="tableNames">This array will be used to create table mappings allowing the DataTables to be referenced    /// by a user defined name (probably the actual table name)    /// </param>    public static void FillDataset(string connectionString, CommandType commandType,      string commandText, DataSet dataSet, string[] tableNames,      params SqlParameter[] commandParameters)    {      if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");      if (dataSet == null) throw new ArgumentNullException("dataSet");      // Create & open a SqlConnection, and dispose of it after we are done      using (SqlConnection connection = new SqlConnection(connectionString))      {        connection.Open();         // Call the overload that takes a connection in place of the connection string        FillDataset(connection, commandType, commandText, dataSet, tableNames, commandParameters);      }    }     /// <summary>    /// Execute a stored procedure via a SqlCommand (that returns a resultset) against the database specified in     /// the connection string using the provided parameter values. This method will query the database to discover the parameters for the     /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.    /// </summary>    /// <remarks>    /// This method provides no access to output parameters or the stored procedure's return value parameter.    ///     /// e.g.:     /// FillDataset(connString, CommandType.StoredProcedure, "GetOrders", ds, new string[] {"orders"}, 24);    /// </remarks>    /// <param name="connectionString">A valid connection string for a SqlConnection</param>    /// <param name="spName">The name of the stored procedure</param>    /// <param name="dataSet">A dataset wich will contain the resultset generated by the command</param>    /// <param name="tableNames">This array will be used to create table mappings allowing the DataTables to be referenced    /// by a user defined name (probably the actual table name)    /// </param>      /// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>    public static void FillDataset(string connectionString, string spName,      DataSet dataSet, string[] tableNames,      params object[] parameterValues)    {      if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");      if (dataSet == null) throw new ArgumentNullException("dataSet");      // Create & open a SqlConnection, and dispose of it after we are done      using (SqlConnection connection = new SqlConnection(connectionString))      {        connection.Open();         // Call the overload that takes a connection in place of the connection string        FillDataset(connection, spName, dataSet, tableNames, parameterValues);      }    }     /// <summary>    /// Execute a SqlCommand (that returns a resultset and takes no parameters) against the provided SqlConnection.     /// </summary>    /// <remarks>    /// e.g.:     /// FillDataset(conn, CommandType.StoredProcedure, "GetOrders", ds, new string[] {"orders"});    /// </remarks>    /// <param name="connection">A valid SqlConnection</param>    /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>    /// <param name="commandText">The stored procedure name or T-SQL command</param>    /// <param name="dataSet">A dataset wich will contain the resultset generated by the command</param>    /// <param name="tableNames">This array will be used to create table mappings allowing the DataTables to be referenced    /// by a user defined name (probably the actual table name)    /// </param>      public static void FillDataset(SqlConnection connection, CommandType commandType,      string commandText, DataSet dataSet, string[] tableNames)    {      FillDataset(connection, commandType, commandText, dataSet, tableNames, null);    }     /// <summary>    /// Execute a SqlCommand (that returns a resultset) against the specified SqlConnection     /// using the provided parameters.    /// </summary>    /// <remarks>    /// e.g.:     /// FillDataset(conn, CommandType.StoredProcedure, "GetOrders", ds, new string[] {"orders"}, new SqlParameter("@prodid", 24));    /// </remarks>    /// <param name="connection">A valid SqlConnection</param>    /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>    /// <param name="commandText">The stored procedure name or T-SQL command</param>    /// <param name="dataSet">A dataset wich will contain the resultset generated by the command</param>    /// <param name="tableNames">This array will be used to create table mappings allowing the DataTables to be referenced    /// by a user defined name (probably the actual table name)    /// </param>    /// <param name="commandParameters">An array of SqlParamters used to execute the command</param>    public static void FillDataset(SqlConnection connection, CommandType commandType,      string commandText, DataSet dataSet, string[] tableNames,      params SqlParameter[] commandParameters)    {      FillDataset(connection, null, commandType, commandText, dataSet, tableNames, commandParameters);    }     /// <summary>    /// Execute a stored procedure via a SqlCommand (that returns a resultset) against the specified SqlConnection     /// using the provided parameter values. This method will query the database to discover the parameters for the     /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.    /// </summary>    /// <remarks>    /// This method provides no access to output parameters or the stored procedure's return value parameter.    ///     /// e.g.:     /// FillDataset(conn, "GetOrders", ds, new string[] {"orders"}, 24, 36);    /// </remarks>    /// <param name="connection">A valid SqlConnection</param>    /// <param name="spName">The name of the stored procedure</param>    /// <param name="dataSet">A dataset wich will contain the resultset generated by the command</param>    /// <param name="tableNames">This array will be used to create table mappings allowing the DataTables to be referenced    /// by a user defined name (probably the actual table name)    /// </param>    /// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>    public static void FillDataset(SqlConnection connection, string spName,      DataSet dataSet, string[] tableNames,      params object[] parameterValues)    {      if (connection == null) throw new ArgumentNullException("connection");      if (dataSet == null) throw new ArgumentNullException("dataSet");      if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");       // If we receive parameter values, we need to figure out where they go      if ((parameterValues != null) && (parameterValues.Length > 0))      {        // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)        SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);         // Assign the provided values to these parameters based on parameter order        AssignParameterValues(commandParameters, parameterValues);         // Call the overload that takes an array of SqlParameters        FillDataset(connection, CommandType.StoredProcedure, spName, dataSet, tableNames, commandParameters);      }      else      {        // Otherwise we can just call the SP without params        FillDataset(connection, CommandType.StoredProcedure, spName, dataSet, tableNames);      }    }     /// <summary>    /// Execute a SqlCommand (that returns a resultset and takes no parameters) against the provided SqlTransaction.     /// </summary>    /// <remarks>    /// e.g.:     /// FillDataset(trans, CommandType.StoredProcedure, "GetOrders", ds, new string[] {"orders"});    /// </remarks>    /// <param name="transaction">A valid SqlTransaction</param>    /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>    /// <param name="commandText">The stored procedure name or T-SQL command</param>    /// <param name="dataSet">A dataset wich will contain the resultset generated by the command</param>    /// <param name="tableNames">This array will be used to create table mappings allowing the DataTables to be referenced    /// by a user defined name (probably the actual table name)    /// </param>    public static void FillDataset(SqlTransaction transaction, CommandType commandType,      string commandText,      DataSet dataSet, string[] tableNames)    {      FillDataset(transaction, commandType, commandText, dataSet, tableNames, null);    }     /// <summary>    /// Execute a SqlCommand (that returns a resultset) against the specified SqlTransaction    /// using the provided parameters.    /// </summary>    /// <remarks>    /// e.g.:     /// FillDataset(trans, CommandType.StoredProcedure, "GetOrders", ds, new string[] {"orders"}, new SqlParameter("@prodid", 24));    /// </remarks>    /// <param name="transaction">A valid SqlTransaction</param>    /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>    /// <param name="commandText">The stored procedure name or T-SQL command</param>    /// <param name="dataSet">A dataset wich will contain the resultset generated by the command</param>    /// <param name="tableNames">This array will be used to create table mappings allowing the DataTables to be referenced    /// by a user defined name (probably the actual table name)    /// </param>    /// <param name="commandParameters">An array of SqlParamters used to execute the command</param>    public static void FillDataset(SqlTransaction transaction, CommandType commandType,      string commandText, DataSet dataSet, string[] tableNames,      params SqlParameter[] commandParameters)    {      FillDataset(transaction.Connection, transaction, commandType, commandText, dataSet, tableNames, commandParameters);    }     /// <summary>    /// Execute a stored procedure via a SqlCommand (that returns a resultset) against the specified     /// SqlTransaction using the provided parameter values. This method will query the database to discover the parameters for the     /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.    /// </summary>    /// <remarks>    /// This method provides no access to output parameters or the stored procedure's return value parameter.    ///     /// e.g.:     /// FillDataset(trans, "GetOrders", ds, new string[]{"orders"}, 24, 36);    /// </remarks>    /// <param name="transaction">A valid SqlTransaction</param>    /// <param name="spName">The name of the stored procedure</param>    /// <param name="dataSet">A dataset wich will contain the resultset generated by the command</param>    /// <param name="tableNames">This array will be used to create table mappings allowing the DataTables to be referenced    /// by a user defined name (probably the actual table name)    /// </param>    /// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>    public static void FillDataset(SqlTransaction transaction, string spName,      DataSet dataSet, string[] tableNames,      params object[] parameterValues)    {      if (transaction == null) throw new ArgumentNullException("transaction");      if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");      if (dataSet == null) throw new ArgumentNullException("dataSet");      if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");       // If we receive parameter values, we need to figure out where they go      if ((parameterValues != null) && (parameterValues.Length > 0))      {        // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)        SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);         // Assign the provided values to these parameters based on parameter order        AssignParameterValues(commandParameters, parameterValues);         // Call the overload that takes an array of SqlParameters        FillDataset(transaction, CommandType.StoredProcedure, spName, dataSet, tableNames, commandParameters);      }      else      {        // Otherwise we can just call the SP without params        FillDataset(transaction, CommandType.StoredProcedure, spName, dataSet, tableNames);      }    }     /// <summary>    /// Private helper method that execute a SqlCommand (that returns a resultset) against the specified SqlTransaction and SqlConnection    /// using the provided parameters.    /// </summary>    /// <remarks>    /// e.g.:     /// FillDataset(conn, trans, CommandType.StoredProcedure, "GetOrders", ds, new string[] {"orders"}, new SqlParameter("@prodid", 24));    /// </remarks>    /// <param name="connection">A valid SqlConnection</param>    /// <param name="transaction">A valid SqlTransaction</param>    /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>    /// <param name="commandText">The stored procedure name or T-SQL command</param>    /// <param name="dataSet">A dataset wich will contain the resultset generated by the command</param>    /// <param name="tableNames">This array will be used to create table mappings allowing the DataTables to be referenced    /// by a user defined name (probably the actual table name)    /// </param>    /// <param name="commandParameters">An array of SqlParamters used to execute the command</param>    private static void FillDataset(SqlConnection connection, SqlTransaction transaction, CommandType commandType,      string commandText, DataSet dataSet, string[] tableNames,      params SqlParameter[] commandParameters)    {      if (connection == null) throw new ArgumentNullException("connection");      if (dataSet == null) throw new ArgumentNullException("dataSet");       // Create a command and prepare it for execution      SqlCommand command = new SqlCommand();      bool mustCloseConnection = false;      PrepareCommand(command, connection, transaction, commandType, commandText, commandParameters, out mustCloseConnection);       // Create the DataAdapter & DataSet      using (SqlDataAdapter dataAdapter = new SqlDataAdapter(command))      {         // Add the table mappings specified by the user        if (tableNames != null && tableNames.Length > 0)        {          string tableName = "Table";          for (int index = 0; index < tableNames.Length; index++)          {            if (tableNames[index] == null || tableNames[index].Length == 0) throw new ArgumentException("The tableNames parameter must contain a list of tables, a value was provided as null or empty string.", "tableNames");            dataAdapter.TableMappings.Add(tableName, tableNames[index]);            tableName += (index + 1).ToString();          }        }         // Fill the DataSet using default values for DataTable names, etc        dataAdapter.Fill(dataSet);         // Detach the SqlParameters from the command object, so they can be used again        command.Parameters.Clear();      }       if (mustCloseConnection)        connection.Close();    }    #endregion     #region UpdateDataset    /// <summary>    /// Executes the respective command for each inserted, updated, or deleted row in the DataSet.    /// </summary>    /// <remarks>    /// e.g.:     /// UpdateDataset(conn, insertCommand, deleteCommand, updateCommand, dataSet, "Order");    /// </remarks>    /// <param name="insertCommand">A valid transact-SQL statement or stored procedure to insert new records into the data source</param>    /// <param name="deleteCommand">A valid transact-SQL statement or stored procedure to delete records from the data source</param>    /// <param name="updateCommand">A valid transact-SQL statement or stored procedure used to update records in the data source</param>    /// <param name="dataSet">The DataSet used to update the data source</param>    /// <param name="tableName">The DataTable used to update the data source.</param>    public static void UpdateDataset(SqlCommand insertCommand, SqlCommand deleteCommand, SqlCommand updateCommand, DataSet dataSet, string tableName)    {      if (insertCommand == null) throw new ArgumentNullException("insertCommand");      if (deleteCommand == null) throw new ArgumentNullException("deleteCommand");      if (updateCommand == null) throw new ArgumentNullException("updateCommand");      if (tableName == null || tableName.Length == 0) throw new ArgumentNullException("tableName");       // Create a SqlDataAdapter, and dispose of it after we are done      using (SqlDataAdapter dataAdapter = new SqlDataAdapter())      {        // Set the data adapter commands        dataAdapter.UpdateCommand = updateCommand;        dataAdapter.InsertCommand = insertCommand;        dataAdapter.DeleteCommand = deleteCommand;         // Update the dataset changes in the data source        dataAdapter.Update(dataSet, tableName);         // Commit all the changes made to the DataSet        dataSet.AcceptChanges();      }    }    #endregion     #region CreateCommand    /// <summary>    /// Simplify the creation of a Sql command object by allowing    /// a stored procedure and optional parameters to be provided    /// </summary>    /// <remarks>    /// e.g.:     /// SqlCommand command = CreateCommand(conn, "AddCustomer", "CustomerID", "CustomerName");    /// </remarks>    /// <param name="connection">A valid SqlConnection object</param>    /// <param name="spName">The name of the stored procedure</param>    /// <param name="sourceColumns">An array of string to be assigned as the source columns of the stored procedure parameters</param>    /// <returns>A valid SqlCommand object</returns>    public static SqlCommand CreateCommand(SqlConnection connection, string spName, params string[] sourceColumns)    {      if (connection == null) throw new ArgumentNullException("connection");      if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");       // Create a SqlCommand      SqlCommand cmd = new SqlCommand(spName, connection);      cmd.CommandType = CommandType.StoredProcedure;       // If we receive parameter values, we need to figure out where they go      if ((sourceColumns != null) && (sourceColumns.Length > 0))      {        // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)        SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);         // Assign the provided source columns to these parameters based on parameter order        for (int index = 0; index < sourceColumns.Length; index++)          commandParameters[index].SourceColumn = sourceColumns[index];         // Attach the discovered parameters to the SqlCommand object        AttachParameters(cmd, commandParameters);      }       return cmd;    }    #endregion     #region ExecuteNonQueryTypedParams    /// <summary>    /// Execute a stored procedure via a SqlCommand (that returns no resultset) against the database specified in     /// the connection string using the dataRow column values as the stored procedure's parameters values.    /// This method will query the database to discover the parameters for the     /// stored procedure (the first time each stored procedure is called), and assign the values based on row values.    /// </summary>    /// <param name="connectionString">A valid connection string for a SqlConnection</param>    /// <param name="spName">The name of the stored procedure</param>    /// <param name="dataRow">The dataRow used to hold the stored procedure's parameter values.</param>    /// <returns>An int representing the number of rows affected by the command</returns>    public static int ExecuteNonQueryTypedParams(String connectionString, String spName, DataRow dataRow)    {      if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");      if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");       // If the row has values, the store procedure parameters must be initialized      if (dataRow != null && dataRow.ItemArray.Length > 0)      {        // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)        SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connectionString, spName);         // Set the parameters values        AssignParameterValues(commandParameters, dataRow);         return SqlHelper.ExecuteNonQuery(connectionString, CommandType.StoredProcedure, spName, commandParameters);      }      else      {        return SqlHelper.ExecuteNonQuery(connectionString, CommandType.StoredProcedure, spName);      }    }     /// <summary>    /// Execute a stored procedure via a SqlCommand (that returns no resultset) against the specified SqlConnection     /// using the dataRow column values as the stored procedure's parameters values.     /// This method will query the database to discover the parameters for the     /// stored procedure (the first time each stored procedure is called), and assign the values based on row values.    /// </summary>    /// <param name="connection">A valid SqlConnection object</param>    /// <param name="spName">The name of the stored procedure</param>    /// <param name="dataRow">The dataRow used to hold the stored procedure's parameter values.</param>    /// <returns>An int representing the number of rows affected by the command</returns>    public static int ExecuteNonQueryTypedParams(SqlConnection connection, String spName, DataRow dataRow)    {      if (connection == null) throw new ArgumentNullException("connection");      if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");       // If the row has values, the store procedure parameters must be initialized      if (dataRow != null && dataRow.ItemArray.Length > 0)      {        // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)        SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);         // Set the parameters values        AssignParameterValues(commandParameters, dataRow);         return SqlHelper.ExecuteNonQuery(connection, CommandType.StoredProcedure, spName, commandParameters);      }      else      {        return SqlHelper.ExecuteNonQuery(connection, CommandType.StoredProcedure, spName);      }    }     /// <summary>    /// Execute a stored procedure via a SqlCommand (that returns no resultset) against the specified    /// SqlTransaction using the dataRow column values as the stored procedure's parameters values.    /// This method will query the database to discover the parameters for the     /// stored procedure (the first time each stored procedure is called), and assign the values based on row values.    /// </summary>    /// <param name="transaction">A valid SqlTransaction object</param>    /// <param name="spName">The name of the stored procedure</param>    /// <param name="dataRow">The dataRow used to hold the stored procedure's parameter values.</param>    /// <returns>An int representing the number of rows affected by the command</returns>    public static int ExecuteNonQueryTypedParams(SqlTransaction transaction, String spName, DataRow dataRow)    {      if (transaction == null) throw new ArgumentNullException("transaction");      if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");      if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");       // Sf the row has values, the store procedure parameters must be initialized      if (dataRow != null && dataRow.ItemArray.Length > 0)      {        // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)        SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);         // Set the parameters values        AssignParameterValues(commandParameters, dataRow);         return SqlHelper.ExecuteNonQuery(transaction, CommandType.StoredProcedure, spName, commandParameters);      }      else      {        return SqlHelper.ExecuteNonQuery(transaction, CommandType.StoredProcedure, spName);      }    }    #endregion     #region ExecuteDatasetTypedParams    /// <summary>    /// Execute a stored procedure via a SqlCommand (that returns a resultset) against the database specified in     /// the connection string using the dataRow column values as the stored procedure's parameters values.    /// This method will query the database to discover the parameters for the     /// stored procedure (the first time each stored procedure is called), and assign the values based on row values.    /// </summary>    /// <param name="connectionString">A valid connection string for a SqlConnection</param>    /// <param name="spName">The name of the stored procedure</param>    /// <param name="dataRow">The dataRow used to hold the stored procedure's parameter values.</param>    /// <returns>A dataset containing the resultset generated by the command</returns>    public static DataSet ExecuteDatasetTypedParams(string connectionString, String spName, DataRow dataRow)    {      if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");      if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");       //If the row has values, the store procedure parameters must be initialized      if (dataRow != null && dataRow.ItemArray.Length > 0)      {        // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)        SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connectionString, spName);         // Set the parameters values        AssignParameterValues(commandParameters, dataRow);         return SqlHelper.ExecuteDataset(connectionString, CommandType.StoredProcedure, spName, commandParameters);      }      else      {        return SqlHelper.ExecuteDataset(connectionString, CommandType.StoredProcedure, spName);      }    }     /// <summary>    /// Execute a stored procedure via a SqlCommand (that returns a resultset) against the specified SqlConnection     /// using the dataRow column values as the store procedure's parameters values.    /// This method will query the database to discover the parameters for the     /// stored procedure (the first time each stored procedure is called), and assign the values based on row values.    /// </summary>    /// <param name="connection">A valid SqlConnection object</param>    /// <param name="spName">The name of the stored procedure</param>    /// <param name="dataRow">The dataRow used to hold the stored procedure's parameter values.</param>    /// <returns>A dataset containing the resultset generated by the command</returns>    public static DataSet ExecuteDatasetTypedParams(SqlConnection connection, String spName, DataRow dataRow)    {      if (connection == null) throw new ArgumentNullException("connection");      if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");       // If the row has values, the store procedure parameters must be initialized      if (dataRow != null && dataRow.ItemArray.Length > 0)      {        // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)        SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);         // Set the parameters values        AssignParameterValues(commandParameters, dataRow);         return SqlHelper.ExecuteDataset(connection, CommandType.StoredProcedure, spName, commandParameters);      }      else      {        return SqlHelper.ExecuteDataset(connection, CommandType.StoredProcedure, spName);      }    }     /// <summary>    /// Execute a stored procedure via a SqlCommand (that returns a resultset) against the specified SqlTransaction     /// using the dataRow column values as the stored procedure's parameters values.    /// This method will query the database to discover the parameters for the     /// stored procedure (the first time each stored procedure is called), and assign the values based on row values.    /// </summary>    /// <param name="transaction">A valid SqlTransaction object</param>    /// <param name="spName">The name of the stored procedure</param>    /// <param name="dataRow">The dataRow used to hold the stored procedure's parameter values.</param>    /// <returns>A dataset containing the resultset generated by the command</returns>    public static DataSet ExecuteDatasetTypedParams(SqlTransaction transaction, String spName, DataRow dataRow)    {      if (transaction == null) throw new ArgumentNullException("transaction");      if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");      if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");       // If the row has values, the store procedure parameters must be initialized      if (dataRow != null && dataRow.ItemArray.Length > 0)      {        // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)        SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);         // Set the parameters values        AssignParameterValues(commandParameters, dataRow);         return SqlHelper.ExecuteDataset(transaction, CommandType.StoredProcedure, spName, commandParameters);      }      else      {        return SqlHelper.ExecuteDataset(transaction, CommandType.StoredProcedure, spName);      }    }     #endregion     #region ExecuteReaderTypedParams    /// <summary>    /// Execute a stored procedure via a SqlCommand (that returns a resultset) against the database specified in     /// the connection string using the dataRow column values as the stored procedure's parameters values.    /// This method will query the database to discover the parameters for the     /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.    /// </summary>    /// <param name="connectionString">A valid connection string for a SqlConnection</param>    /// <param name="spName">The name of the stored procedure</param>    /// <param name="dataRow">The dataRow used to hold the stored procedure's parameter values.</param>    /// <returns>A SqlDataReader containing the resultset generated by the command</returns>    public static SqlDataReader ExecuteReaderTypedParams(String connectionString, String spName, DataRow dataRow)    {      if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");      if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");       // If the row has values, the store procedure parameters must be initialized      if (dataRow != null && dataRow.ItemArray.Length > 0)      {        // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)        SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connectionString, spName);         // Set the parameters values        AssignParameterValues(commandParameters, dataRow);         return SqlHelper.ExecuteReader(connectionString, CommandType.StoredProcedure, spName, commandParameters);      }      else      {        return SqlHelper.ExecuteReader(connectionString, CommandType.StoredProcedure, spName);      }    }      /// <summary>    /// Execute a stored procedure via a SqlCommand (that returns a resultset) against the specified SqlConnection     /// using the dataRow column values as the stored procedure's parameters values.    /// This method will query the database to discover the parameters for the     /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.    /// </summary>    /// <param name="connection">A valid SqlConnection object</param>    /// <param name="spName">The name of the stored procedure</param>    /// <param name="dataRow">The dataRow used to hold the stored procedure's parameter values.</param>    /// <returns>A SqlDataReader containing the resultset generated by the command</returns>    public static SqlDataReader ExecuteReaderTypedParams(SqlConnection connection, String spName, DataRow dataRow)    {      if (connection == null) throw new ArgumentNullException("connection");      if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");       // If the row has values, the store procedure parameters must be initialized      if (dataRow != null && dataRow.ItemArray.Length > 0)      {        // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)        SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);         // Set the parameters values        AssignParameterValues(commandParameters, dataRow);         return SqlHelper.ExecuteReader(connection, CommandType.StoredProcedure, spName, commandParameters);      }      else      {        return SqlHelper.ExecuteReader(connection, CommandType.StoredProcedure, spName);      }    }     /// <summary>    /// Execute a stored procedure via a SqlCommand (that returns a resultset) against the specified SqlTransaction     /// using the dataRow column values as the stored procedure's parameters values.    /// This method will query the database to discover the parameters for the     /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.    /// </summary>    /// <param name="transaction">A valid SqlTransaction object</param>    /// <param name="spName">The name of the stored procedure</param>    /// <param name="dataRow">The dataRow used to hold the stored procedure's parameter values.</param>    /// <returns>A SqlDataReader containing the resultset generated by the command</returns>    public static SqlDataReader ExecuteReaderTypedParams(SqlTransaction transaction, String spName, DataRow dataRow)    {      if (transaction == null) throw new ArgumentNullException("transaction");      if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");      if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");       // If the row has values, the store procedure parameters must be initialized      if (dataRow != null && dataRow.ItemArray.Length > 0)      {        // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)        SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);         // Set the parameters values        AssignParameterValues(commandParameters, dataRow);         return SqlHelper.ExecuteReader(transaction, CommandType.StoredProcedure, spName, commandParameters);      }      else      {        return SqlHelper.ExecuteReader(transaction, CommandType.StoredProcedure, spName);      }    }    #endregion     #region ExecuteScalarTypedParams    /// <summary>    /// Execute a stored procedure via a SqlCommand (that returns a 1x1 resultset) against the database specified in     /// the connection string using the dataRow column values as the stored procedure's parameters values.    /// This method will query the database to discover the parameters for the     /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.    /// </summary>    /// <param name="connectionString">A valid connection string for a SqlConnection</param>    /// <param name="spName">The name of the stored procedure</param>    /// <param name="dataRow">The dataRow used to hold the stored procedure's parameter values.</param>    /// <returns>An object containing the value in the 1x1 resultset generated by the command</returns>    public static object ExecuteScalarTypedParams(String connectionString, String spName, DataRow dataRow)    {      if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");      if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");       // If the row has values, the store procedure parameters must be initialized      if (dataRow != null && dataRow.ItemArray.Length > 0)      {        // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)        SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connectionString, spName);         // Set the parameters values        AssignParameterValues(commandParameters, dataRow);         return SqlHelper.ExecuteScalar(connectionString, CommandType.StoredProcedure, spName, commandParameters);      }      else      {        return SqlHelper.ExecuteScalar(connectionString, CommandType.StoredProcedure, spName);      }    }     /// <summary>    /// Execute a stored procedure via a SqlCommand (that returns a 1x1 resultset) against the specified SqlConnection     /// using the dataRow column values as the stored procedure's parameters values.    /// This method will query the database to discover the parameters for the     /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.    /// </summary>    /// <param name="connection">A valid SqlConnection object</param>    /// <param name="spName">The name of the stored procedure</param>    /// <param name="dataRow">The dataRow used to hold the stored procedure's parameter values.</param>    /// <returns>An object containing the value in the 1x1 resultset generated by the command</returns>    public static object ExecuteScalarTypedParams(SqlConnection connection, String spName, DataRow dataRow)    {      if (connection == null) throw new ArgumentNullException("connection");      if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");       // If the row has values, the store procedure parameters must be initialized      if (dataRow != null && dataRow.ItemArray.Length > 0)      {        // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)        SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);         // Set the parameters values        AssignParameterValues(commandParameters, dataRow);         return SqlHelper.ExecuteScalar(connection, CommandType.StoredProcedure, spName, commandParameters);      }      else      {        return SqlHelper.ExecuteScalar(connection, CommandType.StoredProcedure, spName);      }    }     /// <summary>    /// Execute a stored procedure via a SqlCommand (that returns a 1x1 resultset) against the specified SqlTransaction    /// using the dataRow column values as the stored procedure's parameters values.    /// This method will query the database to discover the parameters for the     /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.    /// </summary>    /// <param name="transaction">A valid SqlTransaction object</param>    /// <param name="spName">The name of the stored procedure</param>    /// <param name="dataRow">The dataRow used to hold the stored procedure's parameter values.</param>    /// <returns>An object containing the value in the 1x1 resultset generated by the command</returns>    public static object ExecuteScalarTypedParams(SqlTransaction transaction, String spName, DataRow dataRow)    {      if (transaction == null) throw new ArgumentNullException("transaction");      if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");      if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");       // If the row has values, the store procedure parameters must be initialized      if (dataRow != null && dataRow.ItemArray.Length > 0)      {        // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)        SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);         // Set the parameters values        AssignParameterValues(commandParameters, dataRow);         return SqlHelper.ExecuteScalar(transaction, CommandType.StoredProcedure, spName, commandParameters);      }      else      {        return SqlHelper.ExecuteScalar(transaction, CommandType.StoredProcedure, spName);      }    }    #endregion     #region ExecuteXmlReaderTypedParams    /// <summary>    /// Execute a stored procedure via a SqlCommand (that returns a resultset) against the specified SqlConnection     /// using the dataRow column values as the stored procedure's parameters values.    /// This method will query the database to discover the parameters for the     /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.    /// </summary>    /// <param name="connection">A valid SqlConnection object</param>    /// <param name="spName">The name of the stored procedure</param>    /// <param name="dataRow">The dataRow used to hold the stored procedure's parameter values.</param>    /// <returns>An XmlReader containing the resultset generated by the command</returns>    public static XmlReader ExecuteXmlReaderTypedParams(SqlConnection connection, String spName, DataRow dataRow)    {      if (connection == null) throw new ArgumentNullException("connection");      if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");       // If the row has values, the store procedure parameters must be initialized      if (dataRow != null && dataRow.ItemArray.Length > 0)      {        // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)        SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);         // Set the parameters values        AssignParameterValues(commandParameters, dataRow);         return SqlHelper.ExecuteXmlReader(connection, CommandType.StoredProcedure, spName, commandParameters);      }      else      {        return SqlHelper.ExecuteXmlReader(connection, CommandType.StoredProcedure, spName);      }    }     /// <summary>    /// Execute a stored procedure via a SqlCommand (that returns a resultset) against the specified SqlTransaction     /// using the dataRow column values as the stored procedure's parameters values.    /// This method will query the database to discover the parameters for the     /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.    /// </summary>    /// <param name="transaction">A valid SqlTransaction object</param>    /// <param name="spName">The name of the stored procedure</param>    /// <param name="dataRow">The dataRow used to hold the stored procedure's parameter values.</param>    /// <returns>An XmlReader containing the resultset generated by the command</returns>    public static XmlReader ExecuteXmlReaderTypedParams(SqlTransaction transaction, String spName, DataRow dataRow)    {      if (transaction == null) throw new ArgumentNullException("transaction");      if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");      if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");       // If the row has values, the store procedure parameters must be initialized      if (dataRow != null && dataRow.ItemArray.Length > 0)      {        // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)        SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);         // Set the parameters values        AssignParameterValues(commandParameters, dataRow);         return SqlHelper.ExecuteXmlReader(transaction, CommandType.StoredProcedure, spName, commandParameters);      }      else      {        return SqlHelper.ExecuteXmlReader(transaction, CommandType.StoredProcedure, spName);      }    }    #endregion   }   /// <summary>  /// SqlHelperParameterCache provides functions to leverage a static cache of procedure parameters, and the  /// ability to discover parameters for stored procedures at run-time.  /// </summary>  public sealed class SqlHelperParameterCache  {    #region private methods, variables, and constructors     //Since this class provides only static methods, make the default constructor private to prevent     //instances from being created with "new SqlHelperParameterCache()"    private SqlHelperParameterCache() { }     private static Hashtable paramCache = Hashtable.Synchronized(new Hashtable());     /// <summary>    /// Resolve at run time the appropriate set of SqlParameters for a stored procedure    /// </summary>    /// <param name="connection">A valid SqlConnection object</param>    /// <param name="spName">The name of the stored procedure</param>    /// <param name="includeReturnValueParameter">Whether or not to include their return value parameter</param>    /// <returns>The parameter array discovered.</returns>    private static SqlParameter[] DiscoverSpParameterSet(SqlConnection connection, string spName, bool includeReturnValueParameter)    {      if (connection == null) throw new ArgumentNullException("connection");      if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");       SqlCommand cmd = new SqlCommand(spName, connection);      cmd.CommandType = CommandType.StoredProcedure;       connection.Open();      SqlCommandBuilder.DeriveParameters(cmd);      connection.Close();       if (!includeReturnValueParameter)      {        cmd.Parameters.RemoveAt(0);      }       SqlParameter[] discoveredParameters = new SqlParameter[cmd.Parameters.Count];       cmd.Parameters.CopyTo(discoveredParameters, 0);       // Init the parameters with a DBNull value      foreach (SqlParameter discoveredParameter in discoveredParameters)      {        discoveredParameter.Value = DBNull.Value;      }      return discoveredParameters;    }     /// <summary>    /// Deep copy of cached SqlParameter array    /// </summary>    /// <param name="originalParameters"></param>    /// <returns></returns>    private static SqlParameter[] CloneParameters(SqlParameter[] originalParameters)    {      SqlParameter[] clonedParameters = new SqlParameter[originalParameters.Length];       for (int i = 0, j = originalParameters.Length; i < j; i++)      {        clonedParameters[i] = (SqlParameter)((ICloneable)originalParameters[i]).Clone();      }       return clonedParameters;    }     #endregion private methods, variables, and constructors     #region caching functions     /// <summary>    /// Add parameter array to the cache    /// </summary>    /// <param name="connectionString">A valid connection string for a SqlConnection</param>    /// <param name="commandText">The stored procedure name or T-SQL command</param>    /// <param name="commandParameters">An array of SqlParamters to be cached</param>    public static void CacheParameterSet(string connectionString, string commandText, params SqlParameter[] commandParameters)    {      if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");      if (commandText == null || commandText.Length == 0) throw new ArgumentNullException("commandText");       string hashKey = connectionString + ":" + commandText;       paramCache[hashKey] = commandParameters;    }     /// <summary>    /// Retrieve a parameter array from the cache    /// </summary>    /// <param name="connectionString">A valid connection string for a SqlConnection</param>    /// <param name="commandText">The stored procedure name or T-SQL command</param>    /// <returns>An array of SqlParamters</returns>    public static SqlParameter[] GetCachedParameterSet(string connectionString, string commandText)    {      if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");      if (commandText == null || commandText.Length == 0) throw new ArgumentNullException("commandText");       string hashKey = connectionString + ":" + commandText;       SqlParameter[] cachedParameters = paramCache[hashKey] as SqlParameter[];      if (cachedParameters == null)      {        return null;      }      else      {        return CloneParameters(cachedParameters);      }    }     #endregion caching functions     #region Parameter Discovery Functions     /// <summary>    /// Retrieves the set of SqlParameters appropriate for the stored procedure    /// </summary>    /// <remarks>    /// This method will query the database for this information, and then store it in a cache for future requests.    /// </remarks>    /// <param name="connectionString">A valid connection string for a SqlConnection</param>    /// <param name="spName">The name of the stored procedure</param>    /// <returns>An array of SqlParameters</returns>    public static SqlParameter[] GetSpParameterSet(string connectionString, string spName)    {      return GetSpParameterSet(connectionString, spName, false);    }     /// <summary>    /// Retrieves the set of SqlParameters appropriate for the stored procedure    /// </summary>    /// <remarks>    /// This method will query the database for this information, and then store it in a cache for future requests.    /// </remarks>    /// <param name="connectionString">A valid connection string for a SqlConnection</param>    /// <param name="spName">The name of the stored procedure</param>    /// <param name="includeReturnValueParameter">A bool value indicating whether the return value parameter should be included in the results</param>    /// <returns>An array of SqlParameters</returns>    public static SqlParameter[] GetSpParameterSet(string connectionString, string spName, bool includeReturnValueParameter)    {      if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");      if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");       using (SqlConnection connection = new SqlConnection(connectionString))      {        return GetSpParameterSetInternal(connection, spName, includeReturnValueParameter);      }    }     /// <summary>    /// Retrieves the set of SqlParameters appropriate for the stored procedure    /// </summary>    /// <remarks>    /// This method will query the database for this information, and then store it in a cache for future requests.    /// </remarks>    /// <param name="connection">A valid SqlConnection object</param>    /// <param name="spName">The name of the stored procedure</param>    /// <returns>An array of SqlParameters</returns>    internal static SqlParameter[] GetSpParameterSet(SqlConnection connection, string spName)    {      return GetSpParameterSet(connection, spName, false);    }     /// <summary>    /// Retrieves the set of SqlParameters appropriate for the stored procedure    /// </summary>    /// <remarks>    /// This method will query the database for this information, and then store it in a cache for future requests.    /// </remarks>    /// <param name="connection">A valid SqlConnection object</param>    /// <param name="spName">The name of the stored procedure</param>    /// <param name="includeReturnValueParameter">A bool value indicating whether the return value parameter should be included in the results</param>    /// <returns>An array of SqlParameters</returns>    internal static SqlParameter[] GetSpParameterSet(SqlConnection connection, string spName, bool includeReturnValueParameter)    {      if (connection == null) throw new ArgumentNullException("connection");      using (SqlConnection clonedConnection = (SqlConnection)((ICloneable)connection).Clone())      {        return GetSpParameterSetInternal(clonedConnection, spName, includeReturnValueParameter);      }    }     /// <summary>    /// Retrieves the set of SqlParameters appropriate for the stored procedure    /// </summary>    /// <param name="connection">A valid SqlConnection object</param>    /// <param name="spName">The name of the stored procedure</param>    /// <param name="includeReturnValueParameter">A bool value indicating whether the return value parameter should be included in the results</param>    /// <returns>An array of SqlParameters</returns>    private static SqlParameter[] GetSpParameterSetInternal(SqlConnection connection, string spName, bool includeReturnValueParameter)    {      if (connection == null) throw new ArgumentNullException("connection");      if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");       string hashKey = connection.ConnectionString + ":" + spName + (includeReturnValueParameter ? ":include ReturnValue Parameter" : "");       SqlParameter[] cachedParameters;       cachedParameters = paramCache[hashKey] as SqlParameter[];      if (cachedParameters == null)      {        SqlParameter[] spParameters = DiscoverSpParameterSet(connection, spName, includeReturnValueParameter);        paramCache[hashKey] = spParameters;        cachedParameters = spParameters;      }       return CloneParameters(cachedParameters);    }     #endregion Parameter Discovery Functions   }

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