public class Form1 : Form
{
        //new instance of Main
        public Main myMain;
        public Server myServer;

        public Form1()
        {
            InitializeComponent();
            myMain = new Main(this);
            myServer = new Server(this);
            myServer.LogEvent += new EventHandler<LogEventArgs>(Form1_LogEvent);
        }

        //Handle log events
        public void Form1_LogEvent(object sender, LogEventArgs e)
        {
            //Make sure we're invoking on the right thread
            if (InvokeRequired)
            {
                //Invoke the other-thread method on the Form thread
                MessageBox.Show("Invoking...");
                    Invoke(new EventHandler<LogEventArgs>(Form1_LogEvent));
                    //return;
            }
            MessageBox.Show("Callign update log");
            this.updateLog(e.EntryString);
        }
}

    public class Main
    {
        //form1 ref
        public Form1 myForm1;

        public Main(Form1 form1ref)
        {
            myForm1 = form1ref;
        }
    }

public class Server
    {
        // The "listener" for incoming connections
        private TcpListener _myListener = new TcpListener(IPAddress.Parse("127.0.0.1"), 11001);

        // The incoming client string
        private static string _data = null;

        // Thread signal
        public static ManualResetEvent allDone = new ManualResetEvent(false);

        // Form1 reference
        private static Form1 _myForm1Ref;

        //Threading and Event
        public event EventHandler<LogEventArgs> LogEvent;
        Thread myServerThread;

        private void OnLogEvent(string entryString)
        {
            EventHandler<LogEventArgs> myHandler = LogEvent;
            if (myHandler != null)
            {
                //Throw the event
                myHandler(this, new LogEventArgs(entryString));
            }
        }

        //Start the thread
        public void startThread()
        {
            myServerThread = new Thread(new ThreadStart(StartListening));
            myServerThread.IsBackground = true;
            myServerThread.Start();
        }

        public Server(Form1 myForm1Ref)
        {
            _myForm1Ref = myForm1Ref;
        }

        public void StartListening()
        {
            // Incoming buffer
            byte[] myBuffer = new Byte[1024];

            // Need socket endpoint
            // Get the host IP info
            IPHostEntry ipHostInfo = Dns.GetHostEntry(Dns.GetHostName());
            // Grab me an IP...
            IPAddress ipAddress = ipHostInfo.AddressList[0];
            // Set the endpoint
            IPEndPoint localEndPoint = new IPEndPoint(ipAddress, 11000);

            // Make a new TCP/IP socket...
            Socket myListener = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);

            EventHandler<LogEventArgs> myEventHandler = LogEvent;

            // Bind socket to endpoint... 
            try
            {
                myListener.Bind(localEndPoint);
                myListener.Listen(100);

                while (true)
                {
                    //set event to nonsignaled
                    allDone.Reset();
                    System.Windows.Forms.MessageBox.Show("Bla");
                    if (myEventHandler != null)
                    {
                        //Throw the event
                        myEventHandler(this, new LogEventArgs(String.Format("Listening for connections on {0}:{1}...", ipAddress.ToString(), "11000")));
                    }
                    //Start socket to listen
                    myListener.BeginAccept(new AsyncCallback(AcceptCallback), myListener);
                    //Wait for a connection...
                    allDone.WaitOne();
                }
            }
            catch (Exception e)
            {
                // handle the exception
            }
        }