public function delPhotoVote($user_id, $photo_id)
    {
        if (!is_numeric($user_id) || 0 >= $user_id) {
            throw new InvalidArgumentException(
                "Api::delPhotoVote user_id field should be positive integer");
        }

        if (!is_numeric($photo_id) || 0 >= $photo_id) {
            throw new InvalidArgumentException(
                "Api::delPhotoVote user_id field should be positive integer");
        }

        /** @var $command \Guzzle\Service\Command\AbstractCommand */
        $command = $this->client->getCommand('DeletePhotoVotes',array('id' => $user_id, 'photo_id'=>$photo_id));

        return $this->executeCommand($command);
    }