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<%@ 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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