GridViewPageEventArgs Class
Assembly: System.Web (in system.web.dll)
The GridView control raises the PageIndexChanging event when a pager button (a button with its CommandName property set to "Page") within the control is clicked, but before the GridView control handles the paging operation. This allows you to provide an event-handling method that performs a custom routine, such as canceling the paging operation, whenever this event occurs.
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| Pager buttons are usually located in the pager row of a GridView control. |
A GridViewPageEventArgs object is passed to the event-handling method, which allows you to determine the index of the page selected by the user and to indicate that the paging operation should be canceled. To cancel the paging operation, set the CancelEventArgs.Cancel property of the GridViewPageEventArgs object to true.
For more information about handling events, see Consuming Events.
For a list of initial property values for an instance of GridViewPageEventArgs, see the GridViewPageEventArgs constructor.
The following example demonstrates how to use the GridViewPageEventArgs object passed to the event-handling method to determine the index of the page selected by the user and to cancel the paging operation.
<%@ Page language="VB" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <script runat="server"> Sub CustomersGridView_PageIndexChanging(ByVal sender As Object, ByVal e As GridViewPageEventArgs) ' Cancel the paging operation if the user attempts to navigate ' to another page while the GridView control is in edit mode. If CustomersGridView.EditIndex <> -1 Then ' Use the Cancel property to cancel the paging operation. e.Cancel = True ' Display an error message. Dim newPageNumber As Integer = e.NewPageIndex + 1 Message.Text = "Please update the record before moving to page " & _ newPageNumber.ToString() & "." Else ' Clear the error message. Message.Text = "" End If End Sub Sub CustomersGridView_RowCancelingEdit(ByVal sender As Object, ByVal e As GridViewCancelEditEventArgs) ' Clear the error message. Message.Text = "" End Sub </script> <html xmlns="http://www.w3.org/1999/xhtml" > <head runat="server"> <title>GridView PageIndexChanging Example</title> </head> <body> <form id="form1" runat="server"> <h3>GridView PageIndexChanging Example</h3> <asp:label id="Message" forecolor="Red" runat="server"/> <br/> <asp:gridview id="CustomersGridView" datasourceid="CustomersSource" autogeneratecolumns="true" emptydatatext="No data available." allowpaging="true" autogenerateeditbutton="true" datakeynames="CustomerID" onpageindexchanging="CustomersGridView_PageIndexChanging" onrowcancelingedit="CustomersGridView_RowCancelingEdit" runat="server"> <pagersettings mode="Numeric" position="Bottom" pagebuttoncount="10"/> <pagerstyle backcolor="LightBlue"/> </asp:gridview> <!-- This example uses Microsoft SQL Server and connects --> <!-- to the Northwind sample database. Use an ASP.NET --> <!-- expression to retrieve the connection string value --> <!-- from the Web.config file. --> <asp:sqldatasource id="CustomersSource" selectcommand="Select [CustomerID], [CompanyName], [Address], [City], [PostalCode], [Country] From [Customers]" updatecommand="Update Customers SET CompanyName=@CompanyName, Address=@Address, City=@City, PostalCode=@PostalCode, Country=@Country WHERE (CustomerID = @CustomerID)" connectionstring="<%$ ConnectionStrings:NorthWindConnectionString%>" runat="server"/> </form> </body> </html>
- AspNetHostingPermission For operating in a hosted environment. Demand value: LinkDemand; Permission value: Minimal.
- AspNetHostingPermission For operating in a hosted environment. Demand value: InheritanceDemand; Permission value: Minimal.
System.EventArgs
System.ComponentModel.CancelEventArgs
System.Web.UI.WebControls.GridViewPageEventArgs
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