// GET: AirFilter
public async Task <ActionResult> Index(int?carID, string sortOrder)
{
var fuelQueryable = from s in db.Fuel.Include(a => a.Car)
select s;
if (carID != null && carID > 0)
{
fuelQueryable = fuelQueryable.Where(d => d.CarID == carID);
ViewBag.CarID = carID;
UpdateCarDescription(carID);
}
var sortDirection = ControllerHelper.GetSortOrder(sortOrder);
UpdateSortDirection(sortDirection);
fuelQueryable = FuelManager.AddSortToQuery(fuelQueryable, sortOrder);
return(View(await fuelQueryable.ToListAsync()));
}