private void button1_Click(object sender, EventArgs e)
{
int ticketAmount = int.Parse(comboBoxTickets.Text);
festivalHandler.ChangeCustomerTickets(theater, customer, ticketAmount);
button1.Visible = false;
pictureBoxTickets.Visible = false;
comboBoxTickets.Visible = false;
label4.Visible = false;
label6.Visible = false;
label5.Visible = false;
label1.Text = "Succesful!";
label2.Text = $"New ticket amount: {comboBoxTickets.Text}";
pictureBox1.Visible = true;
}