private void phòngBanToolStripMenuItem_Click(object sender, EventArgs e)
{
frmQLPhongBan nv = new frmQLPhongBan();
this.Hide();
nv.ShowDialog();
this.Show();
}
private void MnuThemPB_Click(object sender, EventArgs e)
{
frmQLPhongBan frm = new frmQLPhongBan();
frm.ShowDialog();
}