Client.handleConnection C# (CSharp) Method

    protected void handleConnection()
    {
        //Send a keep-alive message to prevent timeout
        if (stopwatch.ElapsedMilliseconds - lastTCPMessageSendTime >= KEEPALIVE_DELAY)
            sendMessageTCP(KLFCommon.ClientMessageID.KEEPALIVE, null);

        if (udpSocket != null && handshakeCompleted)
        {

            //Update the status of the udp connection
            long last_udp_ack = 0;
            long last_udp_send = 0;
            lock (udpTimestampLock)
            {
                last_udp_ack = lastUDPAckReceiveTime;
                last_udp_send = lastUDPMessageSendTime;
            }

            bool udp_should_be_connected =
                last_udp_ack > 0 && (stopwatch.ElapsedMilliseconds - last_udp_ack) < UDP_TIMEOUT_DELAY;

            if (udpConnected != udp_should_be_connected)
            {
                if (udp_should_be_connected)
                    enqueueTextMessage("UDP connection established.", false, true);
                else
                    enqueueTextMessage("UDP connection lost.", false, true);

                udpConnected = udp_should_be_connected;
            }

            //Send a probe message to try to establish a udp connection
            if ((stopwatch.ElapsedMilliseconds - last_udp_send) > UDP_PROBE_DELAY)
                sendUDPProbeMessage();

        }
    }