void dne_FormClosed(object sender, FormClosedEventArgs e)
{
dne=null;
}
private void deleteAnEmployeeToolStripMenuItem_Click(object sender, EventArgs e)
{
if (dne == null)
{
dne = new DeleteAnEmployee();
dne.MdiParent = this;
dne.FormClosed += dne_FormClosed;
dne.Show();
}
else
{
dne.Activate();
}
}