public ActionResult Edit(Zone zone)
 {
     if (ModelState.IsValid)
     {
         db.Entry(zone).State = EntityState.Modified;
         db.SaveChanges();
         return RedirectToAction("Index");
     }
     return View(zone);
 }
        public ActionResult Create(Zone zone)
        {
            if (ModelState.IsValid)
            {
                db.Zones.Add(zone);
                db.SaveChanges();
                return RedirectToAction("Index");
            }

            return View(zone);
        }