public string EncryptLine(string strLine)
        {
            if (string.IsNullOrEmpty(strLine))
            {
                return(string.Empty);
            }

            if (String.Compare("unknown", strLine, true) == 0)
            {
                return(string.Empty);
            }
            CRCTool crc = new CRCTool();

            crc.Init(CRCTool.CRCCode.CRC32);
            ulong  dwcrc  = crc.calc(strLine);
            string strRet = String.Format("{0}", dwcrc);

            return(strRet);
        }