UpdatePanel In Asp.net

Hi Nitin,

The UpdatePanel control is probably the most important control in the ASP.NET AJAX package. It will AJAX'ify controls contained within it, allowing partial rendering of the area. We already used it in the Hello world example, and in this chapter, we will go in depth with more aspects of the control.

The tag has two childtags - the ContentTemplate and the Triggers tags. The ContentTemplate tag is required, since it holds the content of the panel. The content can be anything that you would normally put on your page, from literal text to web controls. The Triggers tag allows you to define certain triggers which will make the panel update it's content. The following example will show the use of both childtags.

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %> DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head runat="server">     <title>UpdatePaneltitle> head> <body>     <form id="form1" runat="server">         <asp:ScriptManager ID="ScriptManager1" runat="server" />         <asp:UpdatePanel runat="server" id="UpdatePanel" updatemode="Conditional">         <Triggers>             <asp:AsyncPostBackTrigger controlid="UpdateButton2" eventname="Click" />         Triggers>             <ContentTemplate>                 <asp:Label runat="server" id="DateTimeLabel1" />                 <asp:Button runat="server" id="UpdateButton1" onclick="UpdateButton_Click" text="Update" />                            ContentTemplate>         asp:UpdatePanel>         <asp:UpdatePanel runat="server" id="UpdatePanel1" updatemode="Conditional">                        <ContentTemplate>                 <asp:Label runat="server" id="DateTimeLabel2" />                 <asp:Button runat="server" id="UpdateButton2" onclick="UpdateButton_Click" text="Update" />             ContentTemplate>         asp:UpdatePanel>     form> body> html>

Here is the CodeBehind. Just add the following method to the file:

protected void UpdateButton_Click(object sender, EventArgs e) {     DateTimeLabel1.Text = DateTime.Now.ToString();     DateTimeLabel2.Text = DateTime.Now.ToString(); }

Please refer the below links

http://msdn.microsoft.com/en-us/library/bb399001.aspx

http://ajax.net-tutorials.com/controls/updatepanel-control/

Thanks