private static long GetModifyMailId(this ModelManager mmng)
        {
            long result = 0L;

            if (mmng != null && mmng.ValidData(EModelType.Model_mailList))
            {
                MailModelData data = mmng.GetData <MailModelData>(EModelType.Model_mailList);
                if (data != null)
                {
                    result = data.modifyMailId;
                }
            }
            return(result);
        }
        private static List <MailData> GetMailDataList(this ModelManager mmng)
        {
            List <MailData> result = null;

            if (mmng != null && mmng.ValidData(EModelType.Model_mailList))
            {
                MailModelData data = mmng.GetData <MailModelData>(EModelType.Model_mailList);
                if (data != null)
                {
                    result = data.mailList;
                }
            }
            return(result);
        }