title: User.Identity.IsAuthenticated vs WebSecurity.IsAuthenticated
body: <p>In an MVC4 app, in a controller logic I want to check if the user is logged in.<br>
  Should I use:  </p>
  
  <pre><code>User.Identity.IsAuthenticated
  </code></pre>
  
  <p>Or:  </p>
  
  <pre><code>WebSecurity.IsAuthenticated
  </code></pre>
  
  <p>As far as I know <code>WebSecurity</code> is just a wrapper. Should I use it or <code>User.Identity</code> has different functionality ? </p>