using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Linq;

using System.Text;

using System.Windows.Forms;

using System.Net.Sockets;

using System.Net;

using System.Threading;

namespace WindowsFormsApplication1

{

    public partial class Form1 : Form

    {

        public Form1()

        {

            InitializeComponent();

        }

        private TcpListener tcp;

        private void button1_Click(object sender, EventArgs e)

        {

            tcp = new TcpListener(IPAddress.Any, 5000);

            tcp.Start();

            Thread t = new Thread(server);

            t.IsBackground = true;

            t.Start(tcp);

        }

        private void server(object o)

        {

            TcpListener list = o as TcpListener;

            this.textBox1.AppendText("连接成功"+"\r\n");

            while (true)

            {

                const int buffer = 256;

                TcpClient client = list.AcceptTcpClient();

                NetworkStream strem = client.GetStream();

                byte[] b = new byte[buffer];

                int r = strem.Read(b, 0, buffer);

                string str = Encoding.UTF8.GetString(b, 0, r);

                this.textBox2.AppendText(client.Client.RemoteEndPoint.ToString() + ":"+str+"\r\n");

                strem.Close();

            }

        }

        public void showmsg(string msg)

        {

            this.textBox2.AppendText(msg + "\r\n");

        }

        private void Form1_Load(object sender, EventArgs e)

        {

            Control.CheckForIllegalCrossThreadCalls = false;

        }

    }

}

using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Linq;

using System.Text;

using System.Windows.Forms;

using System.Net.Sockets;

using System.Net;

using System.Threading;

namespace client

{

    public partial class Form1 : Form

    {

        public Form1()

        {

            InitializeComponent();

        }

        private TcpClient client;

        private void button1_Click(object sender, EventArgs e)

        {

            const int size = 406;

            client = new TcpClient();

            client.Connect(IPAddress.Parse("172.16.5.24"),5000);

            NetworkStream strem = client.GetStream();

            string str = this.textBox1.Text.Trim();

            byte[] b = Encoding.UTF8.GetBytes(str);

            strem.Write(b, 0, b.Length);

            strem.Close();

            client.Close();

        }

        private void Form1_Load(object sender, EventArgs e)

        {

            Control.CheckForIllegalCrossThreadCalls = false;

        }

    }

}