<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="ICallBackEventHandlerSample._Default" %>
DOCTYPE html PUBLIC "-//W3C//DTD XHTML
1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title>ICallbackEventHandlertitle>
<script language="javascript" type="text/javascript">
function GetResult(returnValue,
context) {
document.getElementById("txtDateTime").value = returnValue;
}
function Request()
{
CallServer();
return
false;
}
script>
head>
<body>
<form id="form1" runat="server">
<asp:TextBox ID="txtDateTime" runat="server" Text="">
asp:TextBox>
<asp:Button ID="btnDateTime" OnClientClick="return Request()" runat="server"
Text="Get Server Date
Time" />
form>
body>
html>
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Text;
namespace ICallBackEventHandlerSample
{
public partial class _Default : System.Web.UI.Page, ICallbackEventHandler
{
protected void Page_Load(object sender, EventArgs e)
{
ClientScriptManager scriptManager = Page.ClientScript;
String cbReference = scriptManager.GetCallbackEventReference
(this, "returnValue", "GetResult", "context");
String callbackScript = "function CallServer(returnValue, context)
{" + cbReference + "; }";
scriptManager.RegisterClientScriptBlock(this.GetType(),
"CallServer", callbackScript, true);
}
private string returnValue;
public string GetCallbackResult()
{
return returnValue;
}
public void RaiseCallbackEvent(string eventArgument)
{
returnValue = DateTime.Now.ToString();
}
}
}
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