同一网段的两台电脑通信（转）

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Net;
using System.Net.Sockets;
using System.IO;
using System.Threading;

namespace TCPIPtest
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            //初始化控件
            txtSendMssg.Text = "测试数据";
            //打开Listerner开始监听
            Thread thrListener = new Thread(new ThreadStart(Listen));
           thrListener.Start();  


        }
        //监听数据
        private void Listen()
        {
            int port = 8000;
            string host = "";

            Socket listener = new Socket(AddressFamily .InterNetwork ,
                SocketType .Stream ,ProtocolType.Tcp);
            listener.Bind(new IPEndPoint (IPAddress .Any ,8000));
            //不断监听
            while(true )
            {
                listener.Listen(0);
                Socket socket = listener.Accept();
                NetworkStream ntwStream = new NetworkStream(socket);
                StreamReader strmReader = new StreamReader(ntwStream );
                Invoke(new PrintRecvMssgDelegate(PrintRecvMssg),   
                new object[] { strmReader.ReadToEnd() });  
                socket.Close(); 

            }

                
        }
        //线程内向文本框txtRecvMssg中添加字符串及委托  
       private delegate void PrintRecvMssgDelegate(string s);  
        private void PrintRecvMssg(string info)  
        {  
            txtRecvMssg.Text += string.Format("[{0}]:{1}
",   
                DateTime.Now.ToLongTimeString(), info);  
        }

        private void Form1_FormClosing(object sender, FormClosingEventArgs e)
        {
            Environment.Exit(0);
        }

        private void btnSend_Click(object sender, EventArgs e)
        {
            TcpClient tcpClient = new TcpClient();  
           //tcpClient.Connect(IPAddress.Parse("170.0.0.78"), 2014);  
            tcpClient.Connect(IPAddress.Parse("192.168.1.105"), 8000);  
   
            NetworkStream ntwStream = tcpClient.GetStream();  
           if (ntwStream.CanWrite)  
            {  
               Byte[] bytSend = Encoding.UTF8.GetBytes(txtSendMssg.Text);  
                ntwStream.Write(bytSend, 0, bytSend.Length);  
            }  
           else  
            {  
                MessageBox.Show("无法写入数据流");  
   
                ntwStream.Close();  
                tcpClient.Close();  
   
                return;  
            }  
   
            ntwStream.Close();  
           tcpClient.Close();  

        }  

    }
}