using System;
  using System.IO;
  using System.Net;
  using System.Net.Sockets;
  using System.Text;
  using System.Windows.Forms;
  namespace WindowsFormsApplication2
  {
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        private void button1_Click(object sender, EventArgs e)
        {
            String server = textBox1.Text;
            String message = textBox2.Text;
            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 = 13000;
                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);
                textBox3.Text = textBox3.Text + responseData;
                Console.WriteLine("Received: {0}", responseData);
                // Close everything.
                stream.Close();
                client.Close();
            }
            catch (ArgumentNullException ex)
            {
                Console.WriteLine("ArgumentNullException: {0}", ex);
            }
            catch (SocketException ex)
            {
                Console.WriteLine("SocketException: {0}", ex);
            }
            Console.WriteLine("\n Press Enter to continue...");
            Console.Read();
        }
    }
  }