[jQuery] JQuery AJAX with .NET - Limitations

I noticed the following problem in using jquery AJAX with .NET:

NOTE: I don't have the below problems if I use AjaxPro, just wanted to
do
the same with JQuery. Is this is possible, or should I just stick with
AjaxPro.

1) Cannot return a Datatable to the callback function

        [AjaxPro.AjaxMethod()]
        public System.Data.DataTable GetTestCaseById(int Id)
        {
               objTestCase.TestCaseCode = Id;
               return
objTestCase.GetTestCaseById(objTestCase).Tables[0];
        }

        var ResDataTable=Bubya.TestCase.GetTestCaseById(Id).value;
        if(ResDataTable!=null){
           $('#testcase').value=ResDataTable.Rows[0]
["testcase_summary"];
        }


2) Cannot post to a user control

         $(document).ready(function() {
                 $.post( "wucPeopleList.ascx",
                    {   call_type: 'UpdateAccessRights',
                         user_code: UserCode
                     },
                     function(response){
                     }
                 );
               }
           );