Asp.net 2.0 makes control declarations much easier to manage.Instead of duplicating them on all your pages.just declare them once within the new pages-->controls section with in the web.config file of your application.
<?xml version="1.0"?>
<configuration>
<system.web>
<pages>
<controls>
<add tagPrefix="bala" src="~/Controls/Header.ascx" tagName="header"/>
<add tagPrefix="bala" src="~/Controls/Footer.ascx" tagName="footer"/>
<add tagPrefix="ControlVendor" assembly="ControlVendorAssembly"/>
</controls>
</pages>
</system.web>
</configuration>
<strong>Output:</strong>
<html>
<body>
<form id="form1" runat="server">
<bala:header ID="MyHeader" runat="server" />
</form>
</body>
</html>
