private void Users_SelectionChanged(object sender, SelectionChangedEventArgs e) { user = (UserModel)Users.SelectedItem; MemberName = user.name; items = statisticsVM.GetUserStatistics(user.barcode); int price = 0; foreach (SaleModel item in items) { price += item.price; } TotalPrice = price.ToString() + "원"; count.Header = "Count ▼"; SortedList = items.OrderBy(o => o.count).ToList(); UserOrder.ItemsSource = SortedList; DataContext = null; DataContext = this; }