public MyOrders(string u, string p) { username = u; password = p; InitializeComponent(); using (IwebshopServiceClient shopProxy = new IwebshopServiceClient()) { currentUser = shopProxy.GetUserByName(username, password); int[] orders = shopProxy.GetAllOrdersByCustomerID(currentUser.Id, username, password); foreach (var o in orders) { ordersBox.Items.Add($"{o}"); } } }