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; }