private void button5_Click(object sender, EventArgs e) { be.GetInts(childsum, adultsum, seniorsum); if (adultsum + childsum + seniorsum == 0) { MessageBox.Show("Please add at least one ticket!"); } else { childsum = 0; adultsum = 0; seniorsum = 0; be.Checkout(); MessageBox.Show("Purchased!"); } }