Please refer Mr.Mudassar reply
HTML Page
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title></title>
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.8.3/jquery.min.js"></script>
<script type="text/javascript">
$(document).ready(function () {
$('#Div1').load('Default.aspx');
});
</script>
</head>
<body>
<div id="Div1">
</div>
</body>
</html>
ASPX Page
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:TextBox runat="server" Text="TextBox" />
<asp:Button Text="Button" runat="server" />
</div>
</form>
</body>
</html>
Screenshot of html page
