title: Error validating access token: The session is invalid because the user logged out
body: <p>My code:</p>
  
  <pre><code> var fbWebContext = FacebookWebContext.Current;
   if (fbWebContext.IsAuthorized())
   {
        var fb = new FacebookWebClient(fbWebContext);
        dynamic result = fb.Get("/me");
  
        name.Text = result.name;
   }
  
   dynamic result = fb.Get("/me");
  </code></pre>
  
  <p>throws:</p>
  
  <blockquote>
    <p>(OAuthException) Error validating access token: The session is invalid because the user logged out.</p>
  </blockquote>
  
  <p>How should I change my code to prevent this?</p>