/// <summary>
        /// get all log by tine time span
        /// </summary>
        /// <param name="begin"></param>
        /// <param name="end"></param>
        /// <returns></returns>
        internal List<SystemLog> GetByTime(DateTime begin, DateTime end)
        {
            DBW.DBWSystemLog dbw=new DBW.DBWSystemLog();

            List<SystemLog> listLog = dbw.GetByTine(begin, end);
            return listLog;
        }