C# TCP协议的使用步骤

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Net;
using System.Net.Sockets;
using System.Threading;
using System.Threading.Tasks;
namespace 例4_TcpClient与Listener的界面版
    public partial class Form1 : Form
        public Form1()
            InitializeComponent();
        //private void btnServer_Click(object sender, EventArgs e)
        private async void btnServer_Click(object sender, EventArgs e)
                TcpListener listener = new TcpListener(IPAddress.Parse( "127.0.0.1"),4001);
                listener.Start();
                //这是一个阻断的方法,运行到此就不再向下运行了,所以把客户端与服务器端放在一个程序下是不行的.可以采用多线程方法进行处理.
                //TcpClient tc = listener.AcceptTcpClient(); 
                TcpClient tc = await listener.AcceptTcpClientAsync();  //这是一个异步方法，frameWork4.5以上使用
                NetworkStream stm = tc.GetStream();
                byte[] readBuf = new byte[50];
                stm.Read(readBuf, 0, 50);
                txtMess.Text = Encoding.ASCII.GetString(readBuf);
                //stm.Close();
            catch(Exception ex)
                MessageBox.Show("出现问题:" + ex.Message.ToString());
        private void btnClient_Click(object sender, EventArgs e)
                TcpClient newclient = new TcpClient();
                newclient.Connect("localhost",4001);
                NetworkStream stm = newclient.GetStream();
                byte[] sendbyte = Encoding.ASCII.GetBytes("data is coming here!");
                stm.Write(sendbyte,0,sendbyte.Length);
                //newclient.Close();
            catch (Exception ex)