title: MVC3 Page - IsPostback like functionality
body: <p>I call the same controller many times from _Layout.cshtml view. So in this controller, how can I discover at runtime if it's still same page that is rendering or if a brand new page request is being made? </p>
  
  <p>In asp.net you can use ispostback to figure this out. How can you tell if a brand new request is being made for a page in MVC3?</p>
  
  <p>Thanks</p>