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The UpdatePanel control updates a portion of a page without updating the entire page.
<%@ Page Language="C#" %>
<!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>UpdatePanel Simple</title>
</head>
<body>
<form id="form1" runat="server">
<asp:ScriptManager ID="ScriptManager1" runat="server" />
Page Time: <%= DateTime.Now.ToString("T") %>
<br /><br />
<asp:UpdatePanel
id="up1"
runat="server">
<ContentTemplate>
UpdatePanel Time: <%= DateTime.Now.ToString("T") %>
<br />
<asp:Button
id="btn"
Text="Update"
runat="server" />
</ContentTemplate>
</asp:UpdatePanel>
</form>
</body>
</html>
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