private void button3_Click(object sender, EventArgs e)
{
if (abt == null)
{
if (d != null)
{
d.Close();
}
if (lg != null)
{
lg.Close();
}
abt = new AboutUs();
abt.MdiParent = this;
abt.StartPosition = FormStartPosition.CenterScreen;
abt.FormClosed += new FormClosedEventHandler(Abt_FormClosed);
abt.Show();
}
}
private void Abt_FormClosed(object sender, FormClosedEventArgs e)
{
abt = null;
}
