Proper Logout functionality in asp dot net.. I already tried Java script to prevent back button

http://www.aspsnippets.com/Articles/Disable-Browser-Back-Button-Functionality-using-JavaScript.aspx

I followed the above link to prevent browser from going back but its quite slow and gives a glimpse of the page that its not supposed to go to after logout on pressing back button..

How should I implement Logout so that once if I clear/abandon the session using 

Session.Clear();
Session.RemoveAll();
Session.Abandon();

User must not go to that previous page at all