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IPostBackEventHandler Interface

Defines the method ASP.NET server controls must implement to handle postback events.

Namespace:  System.Web.UI
Assembly:  System.Web (in System.Web.dll)

public interface IPostBackEventHandler

The IPostBackEventHandler type exposes the following members.

  NameDescription
Public methodRaisePostBackEventWhen implemented by a class, enables a server control to process an event raised when a form is posted to the server.
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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 Forms 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.

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' />");   
      }
   }    
}
   

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0, 1.1, 1.0

Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

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

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