GridViewPageEventArgs Class
Definition
Important
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Provides data for the PageIndexChanging event.
public ref class GridViewPageEventArgs : System::ComponentModel::CancelEventArgspublic class GridViewPageEventArgs : System.ComponentModel.CancelEventArgstype GridViewPageEventArgs = class
inherit CancelEventArgsPublic Class GridViewPageEventArgs
Inherits CancelEventArgs- Inheritance
Examples
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="C#" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
void CustomersGridView_PageIndexChanging(Object sender, GridViewPageEventArgs e)
{
// 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)
{
// Use the Cancel property to cancel the paging operation.
e.Cancel = true;
// Display an error message.
int newPageNumber = e.NewPageIndex + 1;
Message.Text = "Please update the record before moving to page " +
newPageNumber.ToString() + ".";
}
else
{
// Clear the error message.
Message.Text = "";
}
}
void CustomersGridView_RowCancelingEdit(Object sender, GridViewCancelEditEventArgs e)
{
// Clear the error message.
Message.Text = "";
}
</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>
<%@ 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>
Remarks
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.
Note
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 how to handle events, see Handling and Raising Events.
For a list of initial property values for an instance of GridViewPageEventArgs, see the GridViewPageEventArgs constructor.
Constructors
| GridViewPageEventArgs(Int32) |
Initializes a new instance of the GridViewPageEventArgs class. |
Properties
| Cancel |
Gets or sets a value indicating whether the event should be canceled. (Inherited from CancelEventArgs) |
| NewPageIndex |
Gets or sets the index of the new page to display in the GridView control. |
Methods
| Equals(Object) |
Determines whether the specified object is equal to the current object. (Inherited from Object) |
| GetHashCode() |
Serves as the default hash function. (Inherited from Object) |
| GetType() |
Gets the Type of the current instance. (Inherited from Object) |
| MemberwiseClone() |
Creates a shallow copy of the current Object. (Inherited from Object) |
| ToString() |
Returns a string that represents the current object. (Inherited from Object) |
