facing problem in logout code in asp.net c#

Question

hii,

 

i m facing problem in logout code in asp.net c#.

 

please give the code which can do:-

 

1) session end

2) when pressing back button after logout it should be redirect to login page.

3)by pasting url of somebody's account in address bar it should not enter in the account and redirect to login page.

 

please provide code for both "session" and "authentication" method.

thank you for your time..