//public async Task<ActionResult> Index()
        //{
        //    WebClient client = new WebClient();
        //    Customer customer = await client.GetCustomer();

        //    return View(customer);
        //}

        public async Task <ActionResult> Index()
        {
            WebClient client   = new WebClient();
            Customer  customer = new Customer {
                ID = 45, Name = "ClientCustomer", Address = "No25", Creditlimit = 25000, Tel = "0112"
            };

            await client.AddCustomer(customer);

            return(View(customer));
        }