void HoaDonDichVuClient_HoaDonDichVu_GetItemsByIDCompleted(object sender, HoaDonDichVu_GetItemsByIDCompletedEventArgs e)
 {
     grvHoaDonDichVu.ItemsSource = e.Result;
     LoadingPanel.IsBusy = false;
 }
 void HoaDon_DichVu_HoaDonDichVu_GetItemsByIDCompleted(object sender, HoaDonDichVu_GetItemsByIDCompletedEventArgs e)
 {
     lstDichVu = e.Result;
     TextBlock txtContent = null;
     foreach (HoaDonDichVuInfo item in lstDichVu)
     {
         txtContent = new TextBlock();
         txtContent.Text = Format_NumberVietnamese(item.TongTien.ToString()) + " [Ngày : " + item.NgaySuDung + " " +  item.SoLuong + "x" + item.DichVuName  +"]";
         DichVu += item.TongTien;
         SPDichVu.Children.Add(txtContent);
     }
     HoaDon.HoaDon_GetItemAsync(HoaDonID);
 }