title: Invalidate all other user sessions
body: <p>I'm developing a web site using ASP .NET MVC 4, I use SimpleMembership for authentication.
  I need to limit the user to having no more than a specific number of sessions using his account. After the user reaches his limit I would like to invalidate his oldest authenticated session.
  Counting sessions may be implemented in global.asax's session_start and session_end methods, but I'm really not sure how to proceed with invalidation. Any ideas will be appreciated.</p>