title: The following code is working in Windows Phone 8 but when i convert into Windows Phone 8.1 NavigationContext is Not Working
body: <p>When i try to declare NavigationContext i am getting error in Windows Phone 8.1</p>
  
  <pre><code>public static string GetFeedbackMailMessage(NavigationContext context)
  {
      string VideoTitle = string.Empty;
      string LinkType = string.Empty;
      string VideoUrl = string.Empty;
      string ShowTitle = string.Empty;
      string FeedbackMessage = string.Empty;
  
      context.QueryString.TryGetValue("chno", out VideoTitle);
      context.QueryString.TryGetValue("LinkType", out LinkType);
      context.QueryString.TryGetValue("uri", out VideoUrl);
      context.QueryString.TryGetValue("title", out ShowTitle);
      if (context.QueryString.TryGetValue("chno", out VideoTitle) &amp;&amp; context.QueryString.TryGetValue("LinkType", out LinkType) &amp;&amp; context.QueryString.TryGetValue("uri", out VideoUrl) &amp;&amp; context.QueryString.TryGetValue("title", out ShowTitle))
      {
          FeedbackMessage = "Movie Name : " + ShowTitle + "\n" + VideoTitle + " \n " + "http://m.youtube.com/watch?v=" + VideoUrl + "\n";
      }
      return FeedbackMessage;
  }
  </code></pre>