private void checkBox2_CheckedChanged(object sender, EventArgs e)
        {
            if (checkBox2.Checked == true)
            {
                pizza1 = new cHam(pizza1);
                label2.Text = pizza1.getDesc();

                double total = pizza1.cost();
                total2 = System.Convert.ToString(total);

                label3.Text = "$" + total2;
            }
        }
        private void radioButton6_CheckedChanged(object sender, EventArgs e)
        {
            if (radioButton6.Checked == true)
            {
                pizza1 = new cNormal(pizza1);
                label2.Text = pizza1.getDesc();

                double total = pizza1.cost();
                total2 = System.Convert.ToString(total);

                label3.Text = "$" + total2;

                //label2.Refresh();
            }
        }
        private void radioButton3_CheckedChanged(object sender, EventArgs e)
        {
            pizza1 = new cLargePizza();
            label2.Text = pizza1.getDesc();

            double total = pizza1.cost();
            total2 = System.Convert.ToString(total);

            label3.Text = "$" + total2;

            Refresh();
        }