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SqlDataSourceFilteringEventHandler Delegate

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

Represents the method that will handle the Filtering event of the SqlDataSource control.

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

public delegate void SqlDataSourceFilteringEventHandler (
	Object sender,
	SqlDataSourceFilteringEventArgs e
)
/** @delegate */
public delegate void SqlDataSourceFilteringEventHandler (
	Object sender, 
	SqlDataSourceFilteringEventArgs e
)
JScript supports the use of delegates, but not the declaration of new ones.

Parameters

sender

The source of the event, a SqlDataSource.

e

An SqlDataSourceFilteringEventArgs that contains the event data.

Filtering is supported when the DataSourceMode property is set to the DataSet value.

When you create an SqlDataSourceFilteringEventHandler delegate, you identify the method that will handle the event. To associate the event with your event handler, add an instance of the delegate to the event. The event handler is called whenever the event occurs, unless you remove the delegate. For more information about event handler delegates, see Consuming Events.

The following code example demonstrates how to retrieve data from the Northwind database and filter it using a FilterExpression and FilterParameters. The FilterExpression of the SqlDataSource is applied anytime the Select method is executed to retrieve data. In this example, the FilterExpression contains a placeholder for a filter parameter, which is contained in the FilterParameters collection. In the Filtering event, the filter parameter is displayed in a Label control.

<%@ Page Language="C#" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<script runat="server">

    //Protected Sub SqlDataSource1_Filtering(ByVal sender As Object, _
    //    ByVal e As System.Web.UI.WebControls.SqlDataSourceFilteringEventArgs)
    //    Label1.Text = e.ParameterValues(0).ToString()
    //End Sub


    protected void SqlDataSource1_Filtering(object sender, SqlDataSourceFilteringEventArgs e)
    {
        Label1.Text = e.ParameterValues[0].ToString();
    }
</script>

<HTML>
    <BODY>
        <FORM id="FORM1" runat="server">

            <p>Show all employees with the following title:
            <asp:DropDownList
                id="DropDownList1"
                runat="server"
                AutoPostBack="True">
                <asp:ListItem>Sales Representative</asp:ListItem>
                <asp:ListItem>Sales Manager</asp:ListItem>
                <asp:ListItem>Vice President, Sales</asp:ListItem>
            </asp:DropDownList></p>

            <asp:SqlDataSource
                id="SqlDataSource1"
                runat="server"
                ConnectionString="<%$ ConnectionStrings:NorthwindConnection %>"
                SelectCommand="SELECT EmployeeID,FirstName,LastName,Title FROM Employees"
                FilterExpression="Title='{0}'" OnFiltering="SqlDataSource1_Filtering">
                <FilterParameters>
                    <asp:ControlParameter Name="Title" ControlId="DropDownList1" PropertyName="SelectedValue"/>
                </FilterParameters>
            </asp:SqlDataSource>

            <p><asp:GridView
                id="GridView1"
                runat="server"
                DataSourceID="SqlDataSource1"
                AutoGenerateColumns="False">
                <columns>
                    <asp:BoundField Visible="False" DataField="EmployeeID" />
                    <asp:BoundField HeaderText="First Name" DataField="FirstName" />
                    <asp:BoundField HeaderText="Last Name" DataField="LastName" />
                </columns>
            </asp:GridView>
                <asp:Label ID="Label1" runat="server" Text="Label"></asp:Label>

        </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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