public ActionResult Index(int raceId)
{
var checkpoint = new CheckpointOrderModel();
Session["checkpoint"] = checkpoint;
ViewBag.RaceId = raceId;
var race = RaceModel.GetById(raceId);
ViewBag.RaceName = race.Name;
ViewBag.Checkpoints = CheckpointModel.GetCheckpoints(raceId);
return View(checkpoint);
}