private void OKButton_Click(object sender, RoutedEventArgs e)
 {
     if (!String.IsNullOrEmpty(txtTenPhong.Text.Trim()))
     {
         PhongClient = new PhongSVCClient();
         if (PhongID == -1)
         {
             PhongClient.Phong_AddCompleted += new EventHandler<System.ComponentModel.AsyncCompletedEventArgs>(PhongClient_Phong_AddCompleted);
             PhongClient.Phong_AddAsync(int.Parse(cbxLoaiPhong.SelectedValue.ToString()), txtTenPhong.Text, int.Parse(cbxTienNghi.SelectedValue.ToString()), int.Parse(txtSoGiuong.Text.ToString()), int.Parse(txtSoNguoi.Text.ToString()));
         }
         else
         {
             PhongClient.Phong_EditCompleted += new EventHandler<System.ComponentModel.AsyncCompletedEventArgs>(PhongClient_Phong_EditCompleted);
             PhongClient.Phong_EditAsync(PhongID, int.Parse(cbxLoaiPhong.SelectedValue.ToString()), txtTenPhong.Text, int.Parse(cbxTienNghi.SelectedValue.ToString()), int.Parse(txtSoGiuong.Text.ToString()), int.Parse(txtSoNguoi.Text.ToString()));
         }
     }
     else
     {
         MessageBox.Show("Kiểm tra lại cái trường bắt buộc nhập", "Thông báo", MessageBoxButton.OK);
     }
 }