QuickFix.Session.GenerateBusinessMessageReject C# (CSharp) Method

        protected void GenerateBusinessMessageReject(Message message, int err, int field)
        {
            string msgType = message.Header.GetString(Tags.MsgType);
            int msgSeqNum = message.Header.GetInt(Tags.MsgSeqNum);
            string reason = FixValues.BusinessRejectReason.RejText[err];
            Message reject;
            if (this.SessionID.BeginString.CompareTo(FixValues.BeginString.FIX42) >= 0)
            {
                reject = msgFactory_.Create(this.SessionID.BeginString, MsgType.BUSINESS_MESSAGE_REJECT);
                reject.SetField(new RefMsgType(msgType));
                reject.SetField(new BusinessRejectReason(err));
            }
            else
            {
                reject = msgFactory_.Create(this.SessionID.BeginString, MsgType.REJECT);
                char[] reasonArray = reason.ToLower().ToCharArray();
                reasonArray[0] = char.ToUpper(reasonArray[0]);
                reason = new string(reasonArray);
            }
            InitializeHeader(reject);
            reject.SetField(new RefSeqNum(msgSeqNum));
            state_.IncrNextTargetMsgSeqNum();

            reject.SetField(new Text(reason));
            Log.OnEvent("Reject sent for Message: " + msgSeqNum + " Reason:" + reason);
            SendRaw(reject, 0);
        }