title: Silverlight: URL parameter in query string escaped
body: <p>in Silverlight 5:</p>
  
  <pre><code>var uri= new Uri("http://www.last.fm/api/auth/?api_key=xyz&amp;cb=http://localhost:19000/callback?bla=blu")
  HtmlPage.Window.Navigate(uri);
  </code></pre>
  
  <p>lands my browser at:
  <a href="http://www.last.fm/api/auth?api_key=xyz&amp;cb=http://localhost:19000/callback%253Fbla=blu" rel="nofollow">http://www.last.fm/api/auth?api_key=xyz&amp;cb=http://localhost:19000/callback%253Fbla=blu</a></p>
  
  <p>Note how the "?" of the URL in the callback parameter gets escaped to %253F - even though, if I look at uri.ToString() in the debugger, it's not escaped.</p>
  
  <p>How can I prevent that from happening?</p>
  
  <p>Many thanks,
  Max</p>