private void OKButton_Click(object sender, RoutedEventArgs e)
 {
     if (cbxDichVu.SelectedValue != null)
     {
         DichVuClient = new DichVuSVCClient();
         DichVuClient.DichVu_Edit_SLCompleted += new EventHandler<System.ComponentModel.AsyncCompletedEventArgs>(DichVuClient_DichVu_Edit_SLCompleted);
         int SoLuongTon = 0;
         if (txtSL.Text.Trim().ToString() != "")
         {
             SoLuongTon = int.Parse(txtSL.Text.Trim().ToString());
         }
         DichVuClient.DichVu_Edit_SLAsync((int)cbxDichVu.SelectedValue, SoLuongTon);
     }
 }
 void ChiTietClient_ChiTietPhieuNhapKho_GetItemCompleted(object sender, ChiTietPhieuNhapKho_GetItemCompletedEventArgs e)
 {
     ChiTietPhieuNhapKhoInfo ChiTiet = e.Result;
     DichVuClient = new DichVuSVCClient();
     DichVuClient.DichVu_Edit_SLAsync(ChiTiet.DichVuID, 0 - ChiTiet.SoLuong);
 }