protected function getGPOLinkDN(GPOLink $gpoLink)
{
$toDn = new ConvertValueToDn();
$toDn->setAttribute('gpoLink');
$toDn->setLdapConnection($this->connection);
$toDn->setOptions(['gpoLink' => ['attribute' => 'displayName', 'filter' => ['objectClass' => 'groupPolicyContainer']]]);
return $toDn->toLdap($gpoLink->getGpo());
}