Ajax ConfirmButtonExtender
ASP.NET AJAX Control Toolkit is an open-source project built on top of the Microsoft ASP.NET AJAX framework. The Ajax Control Toolkit contains a rich set of controls that you can use to build highly responsive and interactive Ajax-enabled Web applications.

The Ajax Control Toolkit contains more than 40 controls. The ConfirmButton is a simple extender that displays the confirm box with a confirmation message and OK, Cancel button also catches clicks on a button and displays a message to end user.
To use the Ajax Control Toolkit in your Visual Studio project, you should add reference to the AjaxControlToolkit.dll in your project.
Default.aspx
<%@ Register assembly="AjaxControlToolkit" namespace="AjaxControlToolkit" tagprefix="asp" %>
<!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 id="Head1" runat="server">
<title>Untitled Page</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<br />
<asp:Label ID="Label2" runat="server" Text="">
</asp:Label>
<br /><br />
<asp:ScriptManager ID="ScriptManager1" runat="server">
</asp:ScriptManager>
<asp:UpdatePanel ID="UpdatePanel1" runat="server">
<ContentTemplate>
<asp:Button ID="btnConfirm" runat="server" Text="Show Server Time"
OnClick="btnConfirm_Click" />
<asp:ConfirmButtonExtender ID="ConfirmButtonExtender1" runat="server"
TargetControlID="btnConfirm"
ConfirmText="Dyou want to see current server time ?"
ConfirmOnFormSubmit="false">
</asp:ConfirmButtonExtender>
<br /><br />
<asp:Label ID="lblMessage" runat="server">
</asp:Label><br />
</ContentTemplate>
</asp:UpdatePanel>
</div>
</form>
</body>
</html>
Full Source | C#
using System;
using System.Data;
using System.Web.UI;
public partial class _Default : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
Label2.Text = "Page Loaded Time - " + DateTime.Now.ToString();
}
protected void btnConfirm_Click(object sender, EventArgs e)
{
lblMessage.Text = "Current Server Time - " + DateTime.Now.ToString();
}
}
Full Source | VB.NET
Partial Class _Default
Inherits System.Web.UI.Page
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
Label2.Text = "Page Loaded Time - " + DateTime.Now.ToString()
End Sub
Protected Sub btnConfirm_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles btnConfirm.Click
lblMessage.Text = "Current Server Time - " + DateTime.Now.ToString()
End Sub
End Class
Click the following links to see full source code
C# Source Code
VB.NET Source Code
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