public ActionResult Login(LoginViewModel model)
        {
            ActionResult result = null;

            try
            {
                if (!ModelState.IsValid)
                {
                    throw new Exception();
                }

                _vm.LoginUser(model.Username, model.Password);

                result = RedirectToAction("Index", "Vending");
            }
            catch (Exception)
            {
                result = View("Login");
            }

            return result;
        }
        private void DisplayLogin()
        {
            Console.Clear();
            Console.WriteLine("Enter username: "******"Enter password: "******"Welcome {_vm.CurrentUser.FirstName} {_vm.CurrentUser.LastName}");
                Console.ReadKey();
                VendingMenu();
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.Message);
                Console.ReadKey();
            }
        }