private void button1_Click(object sender, EventArgs e)
{
int a = Convert.ToInt32(textBox1.Text);
int b = Convert.ToInt32(textBox2.Text);
Drobi d = new Drobi(a, b);
listBox1.Items.Add(d);//zapisivaem obyekt v list box
}
private void button2_Click(object sender, EventArgs e)
{
double d = 0;
for (int i = 0; i < listBox1.Items.Count; i++)
{
Drobi s = listBox1.Items[i] as Drobi;// izzvlekaem obyekt iz list boxa
d += s.Rezult();
}
textBox3.Text = d.ToString();
}