asp.net App.config配置文件帮助类

        /// <summary>

        /// 保存app.config设定

        /// </summary>

        /// <param name="key"></param>

        /// <param name="value"></param>

        public static void SaveAppConfig(string key, string value)

        {

            Configuration config = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);

            config.AppSettings.Settings[key].Value = value;

            config.Save(ConfigurationSaveMode.Modified);

        }