public ActionResult Create(Customer customer)
        {
            if (ModelState.IsValid)
            {
                db.Customers.Add(customer);
                db.SaveChanges();
                return RedirectToAction("Index");
            }

            ViewBag.CustomerTypeId = new SelectList(db.CustomerTypes, "CustomerTypeId", "Name", customer.CustomerTypeId);
            return View(customer);
        }
 public ActionResult Edit(Customer customer)
 {
     if (ModelState.IsValid)
     {
         db.Entry(customer).State = EntityState.Modified;
         db.SaveChanges();
         return RedirectToAction("Index");
     }
     ViewBag.CustomerTypeId = new SelectList(db.CustomerTypes, "CustomerTypeId", "Name", customer.CustomerTypeId);
     return View(customer);
 }