private void _SetGlobalSetting(IntPtr settings, string name, object value)
        {
            var tmp = GetStringValue(value);

            if (NativeCalls.wkhtmltopdf_set_global_setting(settings, name, tmp) == 0)
            {
                var msg = string.Format("Set GlobalSetting '{0}' as '{1}': operation failed!", name, tmp);
                throw new ApplicationException(msg);
            }
        }