redirecting to main page

From: vips (ypul_at_hotmail.com)
Date: 03/30/05 

Date: Wed, 30 Mar 2005 15:48:15 +0100

I am working on asp.net application
what should I do so that if any user directly types the url other than
"mainpage.aspx" of my application, he should be directed to
"mainpage.aspx".
I am managing user access by enabling and disabling the links on the web
page depending on the user.

cheers