private void pbxHinh_Click(object sender, EventArgs e)
{
if (ht) return;
frmTTNV _frm = new frmTTNV(dtoNhanVien, false, true);
_frm.StartPosition = FormStartPosition.CenterScreen;
_frm.Show();
ht = true;
_frm.FormClosed += new FormClosedEventHandler(_frm_FormClosed);
}
