Update Panel example

This is Good Exaple for Update panel for more info

see this site : http://www.aspcode.net/How-Ajax-for-ASPNET-updatepanels-work.aspx

<form id="form1" runat="server">

<asp:ScriptManager ID="ScriptManager1" runat="server">

asp:ScriptManager>

<div>

<table width="80%" border="3">

<tr>

<td>

Label outside all the Update Panels<asp:Label ID="Label3" runat="Server" Font-Bold="true">asp:Label>

<br /><br />

<asp:Button ID="Button3" runat="Server" Text="Refresh" />

<br />

<br />

td>

tr>

<tr>

<td>

<table width="65%" border="2">

<tr>

<td>

<asp:UpdatePanel ID="UpdatePanel1" runat="server" UpdateMode="Conditional">

<ContentTemplate>

Label within the Parent Update Panel

<asp:Label ID="Label1" runat="server" Font-Bold="true">asp:Label>

<br />

<br />

<asp:Button ID="Button1" runat="server" Text="Refresh" />

<table width="40%" border="1">

<tr>

<td>

<asp:UpdatePanel ID="UpdatePanel2" runat="server" UpdateMode="Conditional">

<ContentTemplate>

<br />

<br />

Label within the Child Update Panel

<asp:Label ID="Label2" runat="server" Font-Bold="True">asp:Label>

<br />

<br />

<asp:Button ID="Button2" runat="server" Text="Refresh" />

ContentTemplate>

asp:UpdatePanel>

td>

tr>

table>

ContentTemplate>

asp:UpdatePanel>

td>

tr>

table>

td>

tr>

table>

div>

form>

Default.aspx.cs

protected void Page_Load(object sender, EventArgs e)
{
Label1.Text = System.DateTime.Now.ToString();
Label2.Text = System.DateTime.Now.ToString();
Label3.Text = System.DateTime.Now.ToString();
}