title: Why the parameter being passed to the controller method from jquery is null even it's not?
body: <p>I have been trying to call my .cs method in the controller from jquery json and it gets called but the parameter passed is always null. Why? Even i checked in the console log and it shows the value being passed but somehow it doesn't get passed to the method. It's null. </p>
  
  <pre><code> $('#AppointmentDate').change(function () {
  
                  var AppointmentDate = '2018-04-30'; //document.getElementById('AppointmentDate').value;
  
                  $.ajax
                  ({
                      url: '@Url.Action("GetTimeSlotsByDate", "Appointment")',
                      type: 'GET',
                      contentType: "application/json; charset= utf-8",
                      data: JSON.stringify(AppointmentDate),
                      dataType: 'json',
                      success: function (results) {
  
                          $("#fk_TimeSlotID").html(""); // clear before appending new list 
  
                          $.each(results, function (i, slot) {
                              $("#fk_TimeSlotID").append(
                                  $('&lt;option&gt;&lt;/option&gt;').val(slot.TimeSlotID).html(slot.FromTo));
                          });
  
                          console.log('Time slots returned');
                          console.log(AppointmentDate);
  
                      }
                  });
  </code></pre>
  
  <p>Method:</p>
  
  <pre><code> public ActionResult GetTimeSlotsByDate(DateTime? RequestedAppointmentDate)
          {
              TimeSlotsRepository TimeSlotsRep = new TimeSlotsRepository();
              List&lt;TimeSlotsModel&gt; ListTimeSlotsModel = TimeSlotsRepository.getTimeSlotsByDate(RequestedAppointmentDate);
  
              return Json(ListTimeSlotsModel, JsonRequestBehavior.AllowGet);
          }
  </code></pre>
  
  <p>This is the rendered URL</p>
  
  <pre><code>http://localhost:13924/Appointment/GetTimeSlotsByDate?"2018-04-30"
  </code></pre>