QuickFix.SessionState.GetNextTargetMsgSeqNum C# (CSharp) Method

        public int GetNextTargetMsgSeqNum()
        {
            lock (sync_) { return this.MessageStore.GetNextTargetMsgSeqNum(); }
        }

        protected void NextSequenceReset(Message sequenceReset)
        {
            bool isGapFill = false;

            if (sequenceReset.IsSetField(Fields.Tags.GapFillFlag))
            {
                isGapFill = sequenceReset.GetBoolean(Fields.Tags.GapFillFlag);
            }

            if (!Verify(sequenceReset, isGapFill, isGapFill))
            {
                return;
            }

            if (sequenceReset.IsSetField(Fields.Tags.NewSeqNo))
            {
                int newSeqNo = sequenceReset.GetInt(Fields.Tags.NewSeqNo);
                this.Log.OnEvent("Received SequenceReset FROM: " + state_.GetNextTargetMsgSeqNum() + " TO: " + newSeqNo);

                if (newSeqNo > state_.GetNextTargetMsgSeqNum())
                {
                    state_.SetNextTargetMsgSeqNum(newSeqNo);
                }
                else
                {
                    if (newSeqNo < state_.GetNextTargetMsgSeqNum())
                    {
                        GenerateReject(sequenceReset, FixValues.SessionRejectReason.VALUE_IS_INCORRECT);
                    }
                }
            }
        }