Split

  sRet = sRet.Replace("DB_backup_", "").Replace(".trn.7z", "");

            char[] delimiter = { '_' };

            string[] split = null;

            for (int x = 0; x <= 5; x++)

                split = sRet.Split(delimiter, x);

            string sYr = split[0];

            string sMn = split[1];

            string sDy = split[2];

            string sTm = split[3].Substring(0, 4);

            sRet = string.Format("Last TL from : {0}/{1}/{2} @ {3}", sMn, sDy, sYr, sTm);

            return sRet;