title: Serialize object of multiple classes into a single JSON using Json.NET
body: <p>I want to join objects of several classes together into a single JSON response, using Json.NET.  I want to build the following into a single JSON response:</p>
  
  <pre><code>{
    "data": [
      {
        "from": {
          "name": "Pawan Shrestha",
          "id": "100001187416487"
        },
        "created_time": "2012-04-22T10:21:22+0000",
        "unread": true,
        "to": {
          "name": "Shashwat Tripathi",
          "id": "100000559654730"
        }
      }
    ],
    "summary": {
      "unread_count": 1,
      "total_count": 1,
      "updated_time": "2012-04-22T10:21:22+0000"
    }
    "response_generated_on" : "2012-04-12 14:23:33"
  }
  </code></pre>
  
  <p>I am creating JSON responses in the following way:</p>
  
  <pre><code>Customer cs = new Customer(2011); //2011 is Customer A/c No.
  string j = JsonConvert.SerializeObject(cs);
  </code></pre>