Defines the method ASP.NET server controls must implement to handle postback events.
Namespace:
System.Web.UI
Assembly:
System.Web (in System.Web.dll)
Visual Basic (Declaration)
<AspNetHostingPermissionAttribute(SecurityAction.LinkDemand, Level := AspNetHostingPermissionLevel.Minimal)> _
<AspNetHostingPermissionAttribute(SecurityAction.InheritanceDemand, Level := AspNetHostingPermissionLevel.Minimal)> _
Public Interface IPostBackEventHandler
Dim instance As IPostBackEventHandler
[AspNetHostingPermissionAttribute(SecurityAction.LinkDemand, Level = AspNetHostingPermissionLevel.Minimal)]
[AspNetHostingPermissionAttribute(SecurityAction.InheritanceDemand, Level = AspNetHostingPermissionLevel.Minimal)]
public interface IPostBackEventHandler
[AspNetHostingPermissionAttribute(SecurityAction::LinkDemand, Level = AspNetHostingPermissionLevel::Minimal)]
[AspNetHostingPermissionAttribute(SecurityAction::InheritanceDemand, Level = AspNetHostingPermissionLevel::Minimal)]
public interface class IPostBackEventHandler
public interface IPostBackEventHandler
To create a server control that captures form submission information from the browser, you must implement this interface. For more information on how to use this interface, see Server Event Handling in ASP.NET Web Pages.
The following code example defines a custom button server control that causes postback, captures the postback event using the RaisePostBackEvent method, and raises a Click event on the server.
Imports System
Imports System.Web.UI
Imports System.Collections
Imports System.Collections.Specialized
Namespace CustomControls
<System.Security.Permissions.PermissionSetAttribute(System.Security.Permissions.SecurityAction.Demand, Name:="FullTrust")> Public Class MyButton
Inherits Control
Implements IPostBackEventHandler
' Define the Click event.
Public Event Click As EventHandler
' Invoke delegates registered with the Click event.
Protected Overridable Sub OnClick(e As EventArgs)
RaiseEvent Click(Me, e)
End Sub
' Define the method of IPostBackEventHandler that raises change events.
Public Sub RaisePostBackEvent(eventArgument As String) _
Implements IPostBackEventHandler.RaisePostBackEvent
OnClick(New EventArgs())
End Sub
Protected Overrides Sub Render(output As HtmlTextWriter)
output.Write("<INPUT TYPE = submit name = " & Me.UniqueID & _
" Value = 'Click Me' />")
End Sub
End Class
End Namespace
using System;
using System.Web.UI;
using System.Collections;
using System.Collections.Specialized;
namespace CustomControls {
[System.Security.Permissions.PermissionSet(System.Security.Permissions.SecurityAction.Demand, Name="FullTrust")]
public class MyButton: Control, IPostBackEventHandler {
// Defines the Click event.
public event EventHandler Click;
//Invoke delegates registered with the Click event.
protected virtual void OnClick(EventArgs e) {
if (Click != null) {
Click(this, e);
}
}
// Define the method of IPostBackEventHandler that raises change events.
public void RaisePostBackEvent(string eventArgument){
OnClick(new EventArgs());
}
protected override void Render(HtmlTextWriter output) {
output.Write("<INPUT TYPE = submit name = " + this.UniqueID +
" Value = 'Click Me' />");
}
}
}
Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98
The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.
.NET Framework
Supported in: 3.5, 3.0, 2.0, 1.1, 1.0
Reference
Other Resources