private void btnXacNhanHotel_Click(object sender, EventArgs e) { if (idHotel != -1) { try { client.ConfirmHotelBooking(idHotel); idHotel = -1; hotel_bookings = JsonConvert.DeserializeObject <List <hotel_booking> >(client.GetListBookingOptional_BE("hotel_bookings", cbHotel.Text)); dtHotelBooking.DataSource = hotel_bookings; } catch { } } else { MessageBox.Show("Bạn chưa chọn"); } }