title: How to exclude some members from being serialized to Json?
body: <p>I have an object that I want to serialize to Json format
  I'm using:</p>
  
  <pre><code>    public string ToJson()
      {
          JavaScriptSerializer jsonSerializer = new JavaScriptSerializer();
          string sJSON = jsonSerializer.Serialize(this);
          return sJSON;
      }
  </code></pre>
  
  <p>How do I define some fields in "this" to not be serialized?</p>