function ValidateOldPassword($Value, $Field, $FormPostedValues)
 {
     $OldPassword = ArrayValue('OldPassword', $FormPostedValues, '');
     $Session = Gdn::Session();
     $UserModel = new Gdn_UserModel();
     $UserID = $Session->UserID;
     return (bool) $UserModel->ValidateCredentials('', $UserID, $OldPassword);
 }