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Ajax add_beginRequest

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default2.aspx.cs" Inherits="Default2" %>
<!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>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:ScriptManager ID="ScriptManager1" runat="server">
</asp:ScriptManager>
<asp:UpdatePanel ID="UpdatePanel1" runat="server" UpdateMode="Conditional">
<ContentTemplate >
<%=DateTime.Now %><asp:Button ID="Button2" runat="server" Text="Button"
onclick="Button2_Click" />
</ContentTemplate>
<Triggers>
<asp:AsyncPostBackTrigger ControlID="Button3"/>
</Triggers>
</asp:UpdatePanel>
<asp:UpdateProgress ID="UpdateProgress1" runat="server"
AssociatedUpdatePanelID="UpdatePanel1" DisplayAfter="0">
<ProgressTemplate>
<font color=gray>Loading....¡£</font>
</ProgressTemplate>
</asp:UpdateProgress>
<hr />
<asp:Button ID="Button3" runat="server" onclick="Button3_Click" Text="Button" />
<br />
<mce:script language="javascript" type="text/javascript"><!--
Sys.WebForms.PageRequestManager.getInstance().add_beginRequest(
function(sender, e) {
if (e.get_postBackElement().id != "<%=this.Button3.ID %>") {
return;
}
var up = $get("<%=this.UpdateProgress1.ID %>");
if ("<%=this.UpdateProgress1.DynamicLayout%>"=="True") {
up.style.display = "block";
}
else {


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