Thread safety Socket server?

Question

 Hi I am fairly new to C#.  I am a java programmer that needed to program a certain application in C#.  The hardware device i needed to program only had .Net support.  I needed to create a socket server so i can comunicate with the device by sending in requests from my java application.  My questions lie in thread safety.  I am dealing with an embeded ocx or active x.  When the request comes in and the thread is spawned do i have to do any kind ov invoking on the ocx control?  or is that a thread safe object?  I have posted my code of the server and then 2 methods from the other class that has the code dealing with the device control. does the axCoFPESO1 object have to be invoked or is the way i am handling it fine?

//Start Socket Server  
        public void startServer()  
        {  
            try 
            {  
                int port = Convert.ToInt32(portadd);  
                this.tcpListener = new TcpListener(IPAddress.Any, port);  
                this.listenThread = new Thread(new ThreadStart(ListenForClients));  
                this.listenThread.Start();  
 
            }  
            catch (SocketException se)  
            {  
            }  
        }  
 
 
 //Listen for inbound connnections  
        private void ListenForClients()  
        {  
            try 
            {  
                int count = 0;  
                this.tcpListener.Start();  
                while (true)  
                {  
                    //blocks until a client has connected to the server  
                    sCclient = this.tcpListener.AcceptTcpClient();  
 
                    //create a thread to handle communication   
                    //with connected client  
                    if (clientThread != null)  
                    {  
                        try 
                        {  
                            Console.WriteLine("Aborting " + clientThread.Name);  
                            clientThread.Abort();  
                        }  
                        catch (Exception e)  
                        {  
                            e.GetBaseException();  
                        }  
                    }  
                    ++count;  
                    clientThread = new Thread(new ParameterizedThreadStart(HandleClientComm));  
                    clientThread.Name = "Client Thread# " + count;  
                    clientThread.Start(client);  
                }  
            }  
            catch (SocketException se)  
            {  
            }  
        }  
 
  //Conection is made handle request  
        private void HandleClientComm(object client)  
        {  
            try 
            {  
                tcpClient = (TcpClient)sCclient;  
                if (tcpClient != null)  
                {  
                    clientStream = tcpClient.GetStream();  
                }  
                string request = "";  
                byte[] message = new byte[4096];  
                int bytesRead;  
                bool go = true;  
                while (go)  
                {  
                    bytesRead = 0;  
                    try 
                    {  
                        //blocks until a client sends a message  
                        bytesRead = clientStream.Read(message, 0, 4096);  
                    }  
                    catch (SocketException se)  
                    {  
                        break;  
                    }  
 
                    if (bytesRead == 0)  
                    {  
                        break;  
                    }  
                    //message has successfully been received  
                    ASCIIEncoding encoder = new ASCIIEncoding();  
                    System.Diagnostics.Debug.WriteLine(  
                       encoder.GetString(message, 0, bytesRead));  
                    request = encoder.GetString(message, 0, bytesRead);  
                    if (!DeviceName.Equals("VERIFONE SC5000"))  
                    {  
                        communicateToDevice(DeviceName, request);  
                    }  
                    else 
                    {  
                        sc5000Data = sc5000.ProcessData(request);  
                    }  
 
                    if (logicalName.Equals("MSR") || logicalName.Equals("SIGCAP") || logicalName.Equals("PINPAD"))  
                    {  
                        Thread current = Thread.CurrentThread;  
                        Console.WriteLine(current.Name + " Waiting for Response");  
                        while (!SymbolDevice.receivedData)  
                        {  
                            Thread.Sleep(200);  
                        }  
                        Console.WriteLine(current.Name + " Response Received");  
                        returnResponse();  
                    }  
                    else 
                    {  
                        returnResponse();  
                    }  
                    go = false;  
                }  
            }  
            catch (Exception e)  
            {  
 
            }  
        }  
   //Send response bact to the client  
        public void returnResponse()  
        {  
            String response = "";  
 
            if (DeviceName.Equals("SYMBOL L4250"))  
            {  
                if (logicalName.Equals("MSR"))  
                {  
                    String xml = "";  
                    xml = sym.getXMLRequest();  
                    xml = Header + xml + Trailer;  
 
                    response = xml;  
                }  
                if (logicalName.Equals("PINPAD"))  
                {  
                    String xml = "";  
                    xml = sym.getXMLRequest();  
                    xml = Header + xml + Trailer;  
 
                    response = xml;  
                }  
                if (logicalName.Equals("SIGCAP") || logicalName.Equals("DISPLAY"))  
                {  
                    response = "Done";  
                }  
 
                if (DeviceName.Equals("VERIFONE SC5000"))  
                {  
                    response = sc5000Data;  
                }  
            }  
 
            NetworkStream clientStream = tcpClient.GetStream();  
            ASCIIEncoding encoder = new ASCIIEncoding();  
 
            byte[] buffer = null;  
            buffer = encoder.GetBytes(response + "?" + "\n");  
 
            clientStream.Write(buffer, 0, buffer.Length);  
            clientStream.Flush();  
 
            sc5000Data = "";  
 
            tcpClient.Close();  
        }  
 
 
 

 

        public void startMSR()  
        {  
            try  
            {  
                string req = "V\\FNSWIPEFRM\\TK4\\TS";  
                axCoFPESO1.SendData(req, 1, 1, 1);  
                axCoFPESO1.SendData("V\\FE\\VNswipestatus", 1, 1, 1);  
                receivedData = false;  
            }  
            catch (Exception e1)  
            {  
                Console.WriteLine(e1.GetBaseException());  
            }  
        }  
 
 
        private void ReceivedTrack_DataEvent(object sender, AxFPEINTERFACELib.IFPESOlementationEvents_ReceivedTrackDataEventEvent e)  
        {  
            string track1 = "";  
            string track2 = "";  
            string exp = "";  
            string name = "";  
 
            axCoFPESO1.SendData("V\\FNWAITFRM", 1, 1, 1);  
            string data1 = (string)e.varTrack1Data;  
 
            data1data1 = data1.Substring(1);  
 
            track1 = data1.Substring(0, data1.IndexOf("^"));  
 
            name = data1.Substring(data1.IndexOf("^") + 1);  
            namename = name.Substring(0, name.IndexOf("^"));  
 
            exp = data1.Substring(data1.LastIndexOf("^") + 1, 4);  
            track2 = (string)e.varTrack2Data;  
 
            xmlRequest = "";  
            setINXML(ACCT_NUM, track1);  
            setINXML(EXP_DATE, exp);  
            setINXML(CARDHOLDER, name);  
            setINXML(TRACK_DATA, track2);  
 
            Console.WriteLine(track1);  
            Console.WriteLine(name);  
            Console.WriteLine(exp);  
            Console.WriteLine(track2);  
            receivedData = true;  
 
        }