public ActionResult Ujkoncert(program model)
 {
     if (ModelState.IsValid)
     {
         db.Koncert.Add(model);
         db.SaveChanges();
         return RedirectToAction("Koncert");
     }
     return View(model);
 }
 public ActionResult Koncert_modositas(program model)
 {
     if (ModelState.IsValid)
     {
         db.Entry(model).State = System.Data.EntityState.Modified;
         db.SaveChanges();
         return RedirectToAction("Koncert");
     }
     return View(model);
 }