/// <summary>
        /// Add/update option in config
        /// </summary>
        /// <param name="key"></param>
        /// <param name="value"></param>
        public void SetConf(string key, string value)
        {
            // update remote
            _server.setConf(key, value);

            // update cache
            if (_entity.Config.ContainsKey(key))
            {
                _entity.Config[key] = value;
            }
            else
            {
                _entity.Config.Add(key, value);
            }
        }