title: Windows phone webcontrol format exception
body: <p>I have been using this code for a while working perfectly in my windows phone 7 app im constructing. However all of a sudden it stops working and gives me a format exception error? What i have i been doing wrong since i haven't change a bit in this code since it last worked perfectly?</p>
  
  <pre><code>String url = String.Format("http://www.bing.com/search?q={0}"); 
          webBrowser1.Source = (new Uri(string.Format(url), UriKind.Absolute));
  </code></pre>