public function setEnableVirtualHostFile(string $enable_vhost_file = "F") : CNabuDataObject
    {
        if ($enable_vhost_file === null) {
            throw new ENabuCoreException(
                    ENabuCoreException::ERROR_NULL_VALUE_NOT_ALLOWED_IN,
                    array("\$enable_vhost_file")
            );
        }
        $this->setValue('nb_site_enable_vhost_file', $enable_vhost_file);
        
        return $this;
    }