写入Web.Config中AppSettings的方法

    #region 写入Web.Config的AppSettings
    /// <summary>
    /// 写入Web.Config的AppSettings
    /// </summary>
    /// <param name="key">键值</param>
    /// <param name="value">写入的值</param>
    private static void WriteConfig(string key, string value)
    {
        Configuration MyConfig = WebConfigurationManager.OpenWebConfiguration("~");
        MyConfig.AppSettings.Settings.Remove(key);
        MyConfig.AppSettings.Settings.Add(key, value);
        MyConfig.Save(ConfigurationSaveMode.Modified);
        ConfigurationManager.RefreshSection("appSettings");
    }
    #endregion