private void button2_Click(object sender, EventArgs e)
{
if (a == true)
{
if (f11 == null)
f11 = new Form11();
f11.fo = label4.Text;
f11.Show();
this.Hide();
}
else if (b == true)
{
if (f12 == null)
f12 = new Form12();
f12.fo = label4.Text;
f12.Show();
this.Hide();
}
else if (c == true)
{
if (f13 == null)
f13 = new Form13();
f13.fo = label4.Text;
f13.Show();
this.Hide();
}
}