Try this code may this will help. Paste this code on masterpage’s load event.
If you are not using master pages then you have to paste this code of all the pages (on load event).
Response.Cache.SetExpires(DateTime.UtcNow.AddMinutes(-1));
Response.Cache.SetCacheability(HttpCacheability.NoCache);
Response.Cache.SetNoStore();
On logout
You have to write
Session.Abandon();
Session.Clear();
And redirect to login page.
Code of logout in c#.net

3 comments:
Code is helpful
thanx
Really code working fine
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