Cgw.Service.CgwService.Disconnect C# (CSharp) Method

        public SmcErr Disconnect()
        {
            NLogEx.LoggerEx logEx = new NLogEx.LoggerEx(log);
            SmcErr err = new CgwError();
            if (OperationContext.Current != null)
            {
                string strSessionId = OperationContext.Current.SessionId;
                if (!string.IsNullOrEmpty(strSessionId))
                {
                    err = SessionManage.Instance().RemoveSessionBySessionId(strSessionId);
                    logEx.Info("SMC DisConnect CgwService Successful,Current.SMC IP is : {0}", CgwConst.SmcIp);
                }
                else
                {
                    err.SetErrorNo(CgwError.ERR_CGW_BUSINESS_CURRENTSESSION_NULL);
                    logEx.Warn("Current SessionId is null ! ");
                }
            }
            else
            {
                err.SetErrorNo(CgwError.ERR_CGW_BUSINESS_CURRENTSESSION_NULL);
                logEx.Warn("Current SessionId is null ! ");
            }

            return err;
        }