WebForm.aspx
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<%@ Page Language="vb" AutoEventWireup="false" CodeBehind="WebForm.aspx.vb" Inherits="WebApplication1.WebForm" %>
<%@ 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 runat="server">
<title></title>
<style type="text/css">
.modalBackground
{
background-color: black;
filter: alpha(opacity=60);
opacity: 0.6;
}
.modalPopup
{
background-color:Transparent;
}
</style>
</head>
<body>
<form id="form1" runat="server">
<asp:ToolkitScriptManager ID="ToolkitScriptManager1" runat="server"></asp:ToolkitScriptManager>
<div>
<asp:UpdatePanel ID="UpdatePanel1" runat="server" UpdateMode="Conditional"><ContentTemplate>
<asp:LinkButton ID="LinkButton1" runat="server">LinkButton</asp:LinkButton>
<asp:Button id="btnShowPopup" runat="server" style="display:none" Text="Test" />
<asp:ModalPopupExtender ID="mdlPopup" runat="server" TargetControlID="btnShowPopup" PopupControlID="pnlPopup" BackgroundCssClass="modalBackground" X="0" Y="0" />
<asp:Panel ID="pnlPopup" CssClass="modalPopup" runat="server" style="display:none" ScrollBars="Auto" Height="100px" Width="100px" BackColor="White">
<asp:LinkButton ID="btnCancel" runat="server" CssClass="ControlLink" text="Cancel"></asp:LinkButton>
</asp:Panel>
</ContentTemplate>
</asp:UpdatePanel>
</div>
</form>
</body>
</html>