title: How can I use the JsonObject class?
body: <p>I am building on Windows Phone 7. I noticed in the documentation I can:</p>
  
  <pre><code>JsonObject user = (JsonObject)JsonObject.Load(responseStream);
  bool isMember = user["IsMember"];
  string name = user["Name"];
  int age = user["Age"];
  </code></pre>
  
  <p>How can I import the JsonObject class?</p>