public IActionResult Add(CustomersAddVM viewModel)
 {
     if (!ModelState.IsValid)
     {
         return(View(viewModel));
     }
     try
     {
         service.AddCustomerToDB(viewModel);
     }
     catch (Exception)
     {
         return(View(viewModel));
     }
     return(RedirectToAction("Home", "Cars"));
 }