private void buttonEnter_Click(object sender, EventArgs e) { if (bh.bookingExists(Convert.ToInt32(textBoxCode.Text))) { Registrar_Consumible.CreateExtra frm = new Registrar_Consumible.CreateExtra(); frm.setIdBooking(Convert.ToInt32(textBoxCode.Text)); } else { MessageBox.Show("Booking Number does not exists"); } }