title: How to get a query string in a windows phone 8.1 app?
body: <p>Sorry to ask such a basic question, but I've spent the last 30mins on google and found nothing (very likely my poor search engine skills!)</p>
  
  <p>I'm upgrading (well, moving code) from a windows phone 8 app to a universal app (the windows store code is largely absent at the moment, I'm currently concentrating on porting over the windows phone stuff).  </p>
  
  <p>Previously I was using</p>
  
  <pre><code>NavigationContext.QueryString.TryGetValue 
  </code></pre>
  
  <p>But with 8.1 this doesn't work and I can't for the life of me find out how to get the querystring.</p>
  
  <p>Any help would be very gratefully appreciated.</p>