Page is accessible even after user has logged out

That's not possible. We all gave you different solutions. These are the possible solutions and all this solutions work.

Lastly what you can do is delete temporary files from your browser and try

OK will do that.. 1 more thing is i have added this line in web.config file:

<system.web>         <sessionState mode="InProc" cookieless="false" timeout="10"/>     </system.web>

This should not cause any problem. Also even if your page is visible from cache and you do session checking it will not cause any issues

Ok will try out