public IActionResult Create(Country country)
        {
            if (ModelState.IsValid)
            {
                db.Countries.Add(country);
                db.SaveChanges();
                return RedirectToAction("Index");
            }

            return View(country);
        }
        public IActionResult Edit(Country country)
        {
            if (ModelState.IsValid)
            {
                ////db.ChangeTracker.StateManager.GetOrCreateEntry(country).EntityState = EntityState.Modified;
                db.SaveChanges();
                return RedirectToAction("Index");
            }

            return View(country);
        }