My parameters are still null Ajax to MVC

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Ajax

MVC

Ok i've tried it seems everything i possibly can to make this work, i've got another ajax request which works fine. but this one won't. The paramater passed in is always null.

i inspect the ajax request in browser and the params are the ones in the data field of ajax request, but for some reason the params at the controller method are null. But i've done the method the same way as i have in another ajax request and that one works. I've tried setting dataType: json contentType: 'application/json' and that sort of thing with no prevail, only difference is one accepts a model, and the other a viewModel, but this shouldn't make a difference as its the property names it tries to map correct?

Controller method >

public string CreateNote(IT_Note note){
   IT_Note taskNote = new IT_Note();
   taskNote.DateCreated = DateTime.Now;
   taskNote.CreatedByUserID = db.Users.Where(u => u.UserName == User.Identity.Name).Single().ID;
   taskNote.IT_TaskID = note.IT_TaskID;
   taskNote.Note = note.Note;
   db.IT_Notes.Add(taskNote);
   db.SaveChanges();

   TaskViewModel model = new TaskViewModel();
   model.AllUsers = db.Users.ToList();
   model.Task = db.IT_Tasks.FirstOrDefault(t=> t.IT_TaskID == note.IT_TaskID);

   return RenderPartialViewToString("_AllNotes", model);
}

javascriptCode (tried using hardcoded, and the declared variables):

var _submitNote = function () {
   var url = window.location.href;
   var taskID = parseInt(url.match(/\d+\.?\d*/g)[1]);
   var postData = {
      IT_TaskID: 1,
      Note: $('#note').val()
      };
   $.ajax({
      url: "/Tasks/CreateNote",
      type: "GET",
      data: {
         IT_TaskID: 1,
         Note: "hello ball"
      },
      success: function (response) {
         $('#dialog').hide();
         $('#notes').html(response);
      }
   });
};

the IT_Note Model:

public class IT_Note
{
   [Key]
   public int ID { get; set; }
   public string Note { get; set; }
   public int CreatedByUserID { get; set; }
   public int IT_TaskID { get; set; }
   public DateTime DateCreated { get; set; }
}