public ActionResult Create(AirportAlternate airportalternate)
 {
     if (ModelState.IsValid) {
         airportalternateRepository.InsertOrUpdate(airportalternate);
         airportalternateRepository.Save();
         return RedirectToAction("Index");
     } else {
         return View();
     }
 }
 public void InsertOrUpdate(AirportAlternate airportalternate)
 {
     if (airportalternate.ID == default(int)) {
         // New entity
         context.AirportAlternate.Add(airportalternate);
     } else {
         // Existing entity
         context.AirportAlternate.Attach(airportalternate);
         context.Entry(airportalternate).State = EntityState.Modified;
     }
 }