// GET: Car
public async Task <ActionResult> Index(int?carID, string sortOrder)
{
var car = from s in db.Car
select s;
if (carID != null && carID > 0)
{
car = car.Where(d => d.ID == carID);
}
var sortDirection = ControllerHelper.GetSortOrder(sortOrder);
UpdateSortDirection(sortDirection);
car = CarManager.AddSortToQuery(car, sortOrder);
List <Car> carListItems = car.ToList <Car>();
ViewBag.CarList = carListItems;
return(View(await car.ToListAsync()));
}