title: ASP.NET Identity in Web Forms: how to authorize?
body: <p>everyone,
  I am using ASP.NET Identity that comes with visual studio 2013 express. I use Web Forms. When I create a new project, the login and signup pages are already there and its working. But my question is, when I add a new page, how do I authorize that page to only signed in users (or to a certain role). Do I use Web Site Administration Tool and web.config to do that? Or something else? Since I am not using MVC, I cannot use [Authorize] attribute.
  I cannot find documents online.
  Thank you in advance.</p>