private void BtnRefresh_Click(object sender, RoutedEventArgs e)
 {
     isRefreshing = true;
     tbSearchStr.Clear();
     dpFrom.SelectedDate         = DateTime.Today.AddDays(0);
     dpTo.SelectedDate           = DateTime.Today.AddDays(0);
     dgvPhieuBanHang.ItemsSource = BUS_PhieuBanHang.showData();
     isRefreshing = false;
 }
        private void btnDelete_Click(object sender, RoutedEventArgs e)
        {
            MessageBoxResult result = MessageBox.Show("Bạn có muốn xóa dòng này?", "Confirmation", MessageBoxButton.YesNo);

            if (result == MessageBoxResult.Yes)
            {
                if (dgvPhieuBanHang.SelectedItem != null)
                {
                    DTO_PhieuBanHang obj = dgvPhieuBanHang.SelectedItem as DTO_PhieuBanHang;
                    String           id  = obj.MaPhieuBanHang;

                    if (BUS_PhieuBanHang.Delete(id))
                    {
                        dgvPhieuBanHang.ItemsSource = BUS_PhieuBanHang.showData();
                    }
                    else
                    {
                        MessageBox.Show("Xóa thất bại!");
                    }
                }
            }
        }
 private void Window_Loaded(object sender, RoutedEventArgs e)
 {
     dgvPhieuBanHang.ItemsSource = BUS_PhieuBanHang.showData();
 }