Is there any sample for use System.Net.Sockets

I need build a network receive loop, it use at Client App.
I use the follow code, but it will block the thread.

            static void Connect(String server, String message)
            {
                try
                {
                    // Create a TcpClient.
                    // Note, for this client to work you need to have a TcpServer 
                    // connected to the same address as specified by the server, port
                    // combination.
                    Int32 port = 30200;
                    TcpClient client = new TcpClient(server, port);

                    // Translate the passed message into ASCII and store it as a Byte array.
                    Byte[] data = System.Text.Encoding.ASCII.GetBytes(message);

                    // Get a client stream for reading and writing.
                    //  Stream stream = client.GetStream();

                    NetworkStream stream = client.GetStream();

                    // Send the message to the connected TcpServer. 
                    stream.Write(data, 0, data.Length);

                    Console.WriteLine("Sent: {0}", message);

                    // Receive the TcpServer.response.

                    // Buffer to store the response bytes.
                    data = new Byte[256];

                    // String to store the response ASCII representation.
                    String responseData = String.Empty;

                    // Read the first batch of the TcpServer response bytes.
                    Int32 bytes = stream.Read(data, 0, data.Length);
                    responseData = System.Text.Encoding.ASCII.GetString(data, 0, bytes);
                    Console.WriteLine("Received: {0}", responseData);

                    // Close everything.
                    stream.Close();
                    client.Close();
                }
                catch (ArgumentNullException e)
                {
                    Console.WriteLine("ArgumentNullException: {0}", e);
                }
                catch (SocketException e)
                {
                    Console.WriteLine("SocketException: {0}", e);
                }

                Console.WriteLine("\n Press Enter to continue...");
                Console.Read();
            }

The code block here, when it timeout the code can go on.

Int32 bytes = stream.Read(data, 0, data.Length);

Because there is no main loop which user can control in Xamarin, so I need a sample to tell me how to build a network receive loop.

I use the TcpClient class.