public void InsertOrUpdate(AirportChart airportchart)
 {
     if (airportchart.ID == default(int)) {
         // New entity
         context.AirportChart.Add(airportchart);
     } else {
         // Existing entity
         context.AirportChart.Attach(airportchart);
         context.Entry(airportchart).State = EntityState.Modified;
     }
 }
 public ActionResult Create(AirportChart airportchart)
 {
     if (ModelState.IsValid) {
         airportchartRepository.InsertOrUpdate(airportchart);
         airportchartRepository.Save();
         return RedirectToAction("Index");
     } else {
         ViewBag.PossibleAirport = airportRepository.All;
         return View();
     }
 }