title: How to find the key for a JSON value
body: <p>I have a JSON string <code>"{name :\"daijiepei\"}"</code>.  I'm using a JObject to deserialize it: </p>
  
  <pre><code>JObject json = JObject.Parse(str);
  string value = obj["name"];
  </code></pre>
  
  <p>So I can get the value, but I can't get the JSON key.
  How do I get the key for a JSON value?</p>