public ActionResult Create(Client client)
        {
            if (ModelState.IsValid)
            {
                _db.Clients.Add(client);
                _db.SaveChanges();
                return RedirectToAction("Index");
            }

            return View(client);
        }
 public ActionResult Edit(Client client)
 {
     if (ModelState.IsValid)
     {
         _db.Entry(client).State = EntityState.Modified;
         _db.SaveChanges();
         return RedirectToAction("Index");
     }
     return View(client);
 }