Asp.Net :
<!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>
<style>
#overlay
{
position: fixed;
z-index: 99;
top: 0px;
left: 0px;
background-color: #000;
width: 100%;
height: 100%;
filter: Alpha(Opacity=60);
opacity: 0.6;
-moz-opacity: 0.6;
}
#theprogress
{
background-color: #fff;
border: 1px solid #ccc;
padding: 10px;
width: 300px;
height: 50px;
line-height: 30px;
text-align: center;
}
#modalprogress
{
position: absolute;
top: 40%;
left: 50%;
margin: -11px 0 0 -150px;
color: #990000;
font-weight: bold;
font-size: 14px;
}
</style>
</head>
<body>
<form id="form1" runat="server">
<asp:ScriptManager ID="ScriptManager1" runat="server">
</asp:ScriptManager>
<asp:UpdateProgress ID="prgLoadingStatus" runat="server" DynamicLayout="true">
<ProgressTemplate>
<div id="overlay">
<div id="modalprogress">
<div id="theprogress">
<asp:Image ID="imgWaitIcon" runat="server" ImageAlign="AbsMiddle" ImageUrl="~/img/progress.gif"
Width="230px" /><br />
Please wait...
</div>
</div>
</div>
</ProgressTemplate>
</asp:UpdateProgress>
<asp:UpdatePanel ID="UpdatePanel1" runat="server">
<ContentTemplate>
<asp:Button ID="btnProgress" runat="server" Text="Show Progress" OnClick="btnProgress_Click" />
</ContentTemplate>
</asp:UpdatePanel>
</form>
</body>
</html>
C#:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Threading;
public partial class Default2 : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
}
protected void btnProgress_Click(object sender, EventArgs e)
{
Thread.Sleep(5000);
}
}