title: how to get logout url in Facebook C# SDK?
body: <p>I tried this:</p>
  
  <pre><code> public string GetLogoutUrl()
          {
              return String.Format("https://www.facebook.com/logout.php?next=http%3A%2F%2Fwww.google.com.br&amp;access_token={0}", result.AccessToken);
          }
  </code></pre>
  
  <p>then:</p>
  
  <pre><code>webBrowser.Navigate(GetLogoutUrl());
  </code></pre>
  
  <p>Not worked. The user is redirected to facebook home page and not do logout.</p>
  
  <p>how I do this? Thanks in advance.</p>