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SqlDataSource.SelectCommand Property

Note: This property is new in the .NET Framework version 2.0.

Gets or sets the SQL string that the SqlDataSource control uses to retrieve data from the underlying database.

Namespace: System.Web.UI.WebControls
Assembly: System.Web (in system.web.dll)

public string SelectCommand { get; set; }
/** @property */
public String get_SelectCommand ()

/** @property */
public void set_SelectCommand (String value)

public function get SelectCommand () : String

public function set SelectCommand (value : String)

Property Value

An SQL string that the SqlDataSource uses to retrieve data.

Because different database products use different varieties of SQL, the syntax of the SQL string depends on the current ADO.NET provider being used, which is identified by the ProviderName property. If the SQL string is a parameterized query or command, the placeholder of the parameter also depends on the ADO.NET provider being used. For example, if the provider is the System.Data.SqlClient, which is the default provider for the SqlDataSource class, the placeholder of the parameter is '@parameterName'. However, if the provider is set to the System.Data.Odbc or System.Data.OleDb, the placeholder of the parameter is '?'. For more information on parameterized SQL queries and commands, see Using Parameters with the SqlDataSource Control.

The SelectCommand property can be an SQL string or the name of a stored procedure, if the data source supports stored procedures.

The SelectCommand property delegates to the SelectCommand property of the SqlDataSourceView object that is associated with the SqlDataSource control.

Security noteSecurity Note

For security purposes, the SelectCommand property is not stored is view state. Because it is possible to decode the contents of view state on the client, storing sensitive information about the database structure in view state could result in an information disclosure vulnerability.

This section contains two code examples. The first code example demonstrates how to set the SelectCommand text to a basic SQL query to retrieve data from an ODBC-compliant database and display it in a GridView control. The second code example demonstrates how to set the SelectCommand text to the name of a stored procedure and the SelectCommandType property to the StoredProcedure value to retrieve data from a Microsoft SQL Server database and display it in a DropDownList control.

The following code example demonstrates how to set the SelectCommand text to a basic SQL query to retrieve data from an ODBC-compliant database and display it in a GridView control.

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<HTML>
  <BODY>
    <!-- This example uses a Northwind database that is hosted by an ODBC-compliant
         database. To run this sample, create an ODBC DSN to any database that hosts
         the Northwind database, including Microsoft SQL Server or Microsoft Access,
         change the name of the DSN in the ConnectionString, and view the page.
    -->

    <FORM runat="server">

      <asp:SqlDataSource
          id="SqlDataSource1"
          runat="server"
          ProviderName="System.Data.Odbc"
          DataSourceMode="DataSet"
          ConnectionString="dsn=myodbc3dsn;"
          SelectCommand="SELECT FirstName, LastName, Title FROM Employees">
      </asp:SqlDataSource>

      <asp:GridView
          id="GridView1"
          runat="server"
          AllowSorting="True"
          DataSourceID="SqlDataSource1">
      </asp:GridView>

    </FORM>
  </BODY>
</HTML>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<HTML>
  <BODY>
    <!-- This example uses a Northwind database that is hosted by an ODBC-compliant
         database. To run this sample, create an ODBC DSN to any database that hosts
         the Northwind database, including Microsoft SQL Server or Microsoft Access,
         change the name of the DSN in the ConnectionString, and view the page.
    -->

    <FORM runat="server">

      <asp:SqlDataSource
          id="SqlDataSource1"
          runat="server"
          ProviderName="System.Data.Odbc"
          DataSourceMode="DataSet"
          ConnectionString="dsn=myodbc3dsn;"
          SelectCommand="SELECT FirstName, LastName, Title FROM Employees">
      </asp:SqlDataSource>

      <asp:GridView
          id="GridView1"
          runat="server"
          AllowSorting="True"
          DataSourceID="SqlDataSource1">
      </asp:GridView>

    </FORM>
  </BODY>
</HTML>

The following code example demonstrates how to set the SelectCommand text to the name of a stored procedure and the SelectCommandType property to the StoredProcedure value to retrieve data from a SQL Server database and display it in a DropDownList control. The SelectCommand property can be an SQL query or the name of a stored procedure, if the data source supports stored procedures.

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<HTML>
    <BODY>
        <FORM runat="server">

            <asp:DropDownList
                id="DropDownList1"
                runat="server"
                DataTextField="LastName"
                DataSourceID="SqlDataSource1" />

            <asp:SqlDataSource
                id="SqlDataSource1"
                runat="server"
                ConnectionString="<%$ ConnectionStrings:MyNorthwind%>"
                SelectCommandType="StoredProcedure"                
                SelectCommand="sp_lastnames">
            </asp:SqlDataSource>

            <!--
                The sp_lastnames stored procedure is
                CREATE PROCEDURE sp_lastnames AS
                   SELECT LastName FROM Employees
                GO
            -->

        </FORM>
    </BODY>
</HTML>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<HTML>
    <BODY>
        <FORM runat="server">

            <asp:DropDownList
                id="DropDownList1"
                runat="server"
                DataTextField="LastName"
                DataSourceID="SqlDataSource1" />

            <asp:SqlDataSource
                id="SqlDataSource1"
                runat="server"
                ConnectionString="Data Source=localhost;Integrated Security=SSPI;Initial Catalog=Northwind;"
                SelectCommand="sp_lastnames">
            </asp:SqlDataSource>

            <!--
                The sp_lastnames stored procedure is
                CREATE PROCEDURE sp_lastnames AS
                   SELECT LastName FROM Employees
                GO
            -->

        </FORM>
    </BODY>
</HTML>

Windows 98, Windows 2000 SP4, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see System Requirements.

.NET Framework

Supported in: 2.0

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