Im trying to develop my first ASP.NET MVC web app and have run into a problem with the jquery ui autocomplete widget.

At the moment I have a form with a number of text boxs which would lend themselves well to an autocomplete ability.

The code for my "Make"(Car make) text box is show below:

jquery:

$(function() {
     $("#Make").autocomplete({
          source: '<%=Url.Action("Make","AutoComplete") %>' 
     });
});

ASP.NET MVC controller:

public ActionResult Make(string term)
{
    return Json(Service.GetHints(HintType.Make, term, 20));
}

GetHints() returns an IList of Hints, an object with just label and value string properties. The documentation implies that this is what I should be returning to the jquery but it doesnt want to work? Can anyone give me any advice/help?