private void pb_back_Click(object sender, EventArgs e)
{
am = new AlgorithmMenu();
am.FormClosed += Am_FormClosed;
am.Show();
this.Close();
}
private void Ad_FormClosed(object sender, FormClosedEventArgs e)
{
am = null;
}
private void btn_start_Click(object sender, EventArgs e)
{
am = new AlgorithmMenu();
am.FormClosed += Ad_FormClosed;
am.Show();
}