Hi
If our requirement to update some portion of page on basis of some time interval, then we can use “Ajax Timer” control. Here I m updating the system date on some time interval (2 sec).
We can do like this
Step1: Take ScriptManager,Timer,UpdatePanel, Label control and arrange the code like this
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="TimerControl.aspx.cs" Inherits="TimerControl" %>
<!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></title>
</head>
<body>
<form id="form1" runat="server">
<div><asp:ScriptManager ID="ScriptManager1" runat="server"/>
<asp:Timer ID="Timer1" Interval="2000" runat="server" ontick="Timer1_Tick"/>
<asp:UpdatePanel ID="UpdatePanel1" runat="server">
<Triggers>
<asp:AsyncPostBackTrigger ControlID="Timer1" EventName="Tick" /></Triggers>
<ContentTemplate>
<p>Date will update on interval of 2 secounds</p>
<asp:Label ID="LblDate" runat="server" Font-Bold="true" ForeColor="Red" Text=""></asp:Label>
</ContentTemplate>
</asp:UpdatePanel></div>
</form>
</body>
</html>
Step2:Write the code in code behind page like this
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;public partial class TimerControl : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{}
protected void Timer1_Tick(object sender, EventArgs e)
{LblDate.Text = System.DateTime.Now.ToString();
}
}
Chandradev's Blog 
This is best one article so far I have read online. I would like to appreciate you for making it very simple and easy. I have found another nice post related to this post over the internet which also explained very well. For more details you may check it by visiting this url……..
http://mindstick.com/Articles/385ebacd-89e2-40d3-868a-0185e7c45f15/?ASP.Net%20AJAX%20Server%20Control:%20Timer
Thanks
Thanks for sharing the URL and you are welcome.I m glad to hear nice feedback from you.