.net – How to clear out session on log out

asp.netasp.net-sessionnet

I redirect the user to the login page when user click log out however I don't think it clears any application or session because all the data persisted when the user logs back in.

Currently the login page has a login control and the code behind on the page is only wired up the login Authenticate.

Can someone direct me to a good tutorial or article about handling log in and out of ASP.NET web sites?