private void frmPhongBan_FormClosed(object sender, FormClosedEventArgs e)
{
frmMainNV frm = new frmMainNV();
frm.Show();
this.Hide();
}
private void btnThoat_Click(object sender, EventArgs e)
{
frmMainNV frm = new frmMainNV();
frm.Show();
this.Hide();
}
private void frmDuAn_FormClosed(object sender, FormClosedEventArgs e)
{
frmMainNV fm = new frmMainNV();
fm.Show();
this.Hide();
}