CgwMonitorManage.Service.SessionManage.AddSession C# (CSharp) Method

        public SmcErr AddSession(Guid sessionGuid, CgwSession smcSession)
        {
            SmcErr err = new SmcErr();

            if (rwl.TryEnterWriteLock(CgwConst.ENTER_LOCK_WAIT_TIME))
            {
                try
                {
                    if (sessionDict.ContainsKey(sessionGuid))
                    {
                        sessionDict.Remove(sessionGuid);
                    }
                    sessionDict.Add(sessionGuid, smcSession);

                }
                finally
                {
                    rwl.ExitWriteLock();
                }
            }

            return err;
        }