private void visitorsToolStripMenuItem_Click(object sender, EventArgs e)
{
if (visitors == null)
{
visitors = new frmVisitorsRegistration();
visitors.MdiParent = this;
visitors.FormClosed += new FormClosedEventHandler(visitors_FormClosed);
visitors.Show();
}
else
{
visitors.Activate();
visitors.WindowState = FormWindowState.Normal;
}
}
void visitors_FormClosed(object sender, FormClosedEventArgs e)
{
visitors = null;
}