private void button1_Click(object sender, EventArgs e)
{
p1 = new prototip();
p1.Kitapad = textBox1.Text;
p1.Tür = textBox2.Text;
p1.Fiyat = textBox3.Text;
}
private void button2_Click(object sender, EventArgs e)
{
p2 = (prototip)p1.Clone();
label7.Text = p2.Kitapad;
label8.Text = p2.Tür;
label9.Text = p2.Fiyat;
}