using JavaScriptSerializer to serialize object to json

<script src="http://www.cnblogs.com/Scripts/MicrosoftAjax.js" type="text/javascript"></script>
<script src="http://www.cnblogs.com/Scripts/jquery-1.5.1.js" type="text/javascript"></script>
<script type="text/javascript">
    function test() {
      
      var o = {};
      o.name = "lie";
      o.age = 22;
      o.addresses = [];

      o.addresses[0] = {};
      o.addresses[0].country = "China";
      o.addresses[0].city = "Shanghai";

      o.addresses[1] = {};
      o.addresses[1].country = "US";
      o.addresses[1].city = "New York";

      var json = Sys.Serialization.JavaScriptSerializer.serialize(o);      

      $.ajax({
          url: "Home/Test2",
          type: "POST",
          data: json,
          contentType: "application/json"
      });
    }
</script>