public ActionResult Edit(BookingExternal bookingexternal)
 {
     if (ModelState.IsValid)
     {
         db.Entry(bookingexternal).State = EntityState.Modified;
         db.SaveChanges();
         return RedirectToAction("Index");
     }
     ViewBag.PropertyID = new SelectList(db.Properties, "PropertyID", "LegacyReference", bookingexternal.PropertyID);
     return View(bookingexternal);
 }
        public ActionResult Create(BookingExternal bookingexternal)
        {
            if (ModelState.IsValid)
            {
                db.BookingExternals.Add(bookingexternal);
                db.SaveChanges();
                return RedirectToAction("Create");
            }

            ViewBag.PropertyID = new SelectList(db.Properties, "PropertyID", "LegacyReference", bookingexternal.PropertyID);
            return View(bookingexternal);
        }