How to implement Secure web page navigations in asp.net ?

Question

Hello,

 

am vinayak i want to know how to make secure web pages in asp.net am storing user name in session after login using that only am checking only if session is empty or not but how to avoid the problem when any one try to open the page he/she will get the page since the session will be there how to implement the secure page like in hotmail if you try to open the url from diff system it will not allow to open it will navigate to login page.

 

my main point :

1)how to avoid others to open my web pages when i am logged in or if am logged out.

2)how to make session empty when we will cancel the tab or close the browser.

 

thanks in advance