System.Net.Sockets.Socket.Listen C# (CSharp) Method

        public void Listen(int backlog)
        {
            if (NetEventSource.IsEnabled) NetEventSource.Enter(this, backlog);
            if (CleanedUp)
            {
                throw new ObjectDisposedException(this.GetType().FullName);
            }

            if (NetEventSource.IsEnabled) NetEventSource.Info(this, $"backlog:{backlog}");

            // No access permissions are necessary here because the verification is done for Bind.

            // This may throw ObjectDisposedException.
            SocketError errorCode = SocketPal.Listen(_handle, backlog);

#if TRACE_VERBOSE
            if (NetEventSource.IsEnabled)
            {
                try
                {
                    if (NetEventSource.IsEnabled) NetEventSource.Info(this, $"SRC:{LocalEndPoint} Interop.Winsock.listen returns errorCode:{errorCode}");
                }
                catch (ObjectDisposedException) { }
            }
#endif

            // Throw an appropriate SocketException if the native call fails.
            if (errorCode != SocketError.Success)
            {
                // Update the internal state of this socket according to the error before throwing.
                SocketException socketException = new SocketException((int)errorCode);
                UpdateStatusAfterSocketError(socketException);
                if (NetEventSource.IsEnabled) NetEventSource.Error(this, socketException);
                throw socketException;
            }
            _isListening = true;
            if (NetEventSource.IsEnabled) NetEventSource.Exit(this);
        }

        // Initialize all of the default certificates and protocols
        public SslServer()
        {
            // Initialize the Socket
            serverSocketType = SocketType.Stream;
            serverProtocolType = ProtocolType.Tcp;

            if (Microsoft.SPOT.Hardware.SystemInfo.SystemID.SKU == 3)
            {
                cert = new X509Certificate(CertificatesAndCAs.emuCert, "NetMF");
                ca = new X509Certificate[] { new X509Certificate(CertificatesAndCAs.caEmuCert) };
            }
            else
            {
                // Initialize the SslStream
                cert = new X509Certificate(CertificatesAndCAs.newCert);
                ca = new X509Certificate[] { new X509Certificate(CertificatesAndCAs.caCert) };
            }
            verify = SslVerification.NoVerification;
            sslProtocols = new SslProtocols[] { SslProtocols.Default };

            // Create a TCP/IP (IPv4) socket and listen for incoming connections.
            serverSocket = new Socket(AddressFamily.InterNetwork, serverSocketType, serverProtocolType);
            serverSocket.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.Linger, false);

            serverSocket.Bind(new IPEndPoint(IPAddress.Loopback, 0));
            serverEp = (IPEndPoint)serverSocket.LocalEndPoint;

            Debug.Print("Listening for a client to connect...");
            serverSocket.Listen(1);
        }