Calling a Page method with complex parameter using jason.stringfy() method

Most of the time when i tried to search for executing server side static page methods using jquery I came across simple example which explained how to call page methods which took parameters of simple types like string and integer.However none of the example explained how we can send complex object to the page method.

Consider this scenario i have a Page method which take in a parameter of type Employee and returns returns the corresponding Manager some thing like this.

    function GetData() {
       var DTO = { "emp": { "__type": "ResearchWebApplication.Employee", "Name": "Amit", "ID": 1, "Telephone": null} }
       $.ajax({
           type: "POST",
           contentType: "application/json; charset=utf-8",
           url: "Default.aspx/ShowGetmanager",
           data: JSON.stringify(DTO), 
           dataType: "json",
           success: function(msg) {
           $('div#OutputDiv').append(JSON.stringify(msg));
              alert(msg.d);
          }, error: HandleError
       });

   }

   function HandleError(jqXHR, textStatus, errorThrown) {
       $('div#OutputDiv').append(JSON.stringify(errorThrown));
   }