[HttpGet]
public JsonResult Search(string data, int id)
{
    var date = DateTime.Now;
    if(!string.IsNullOrEmpty(data))
        date = DateTime.Parse(data);
    var result = Repository.FindBy(date, id); // (1)
    return Json(result, JsonRequestBehavior.AllowGet);
}

function successHandler(success){
    console.log(success); // (2)
    return success;
}

function errorHandler(error){
    console.error(error); // (3)
    return error;
}

$.ajax({
    type: 'GET',
    contentType: 'application/json',
    url: '/Items/Search/2015-01-01/Id/2',
}).then(successHandler, errorHandler);

{ readyState: 4,
  responseText: "",
  status: 200,
  statusText: "OK" }