static void Main(string[] args) 
    { 
      TcpClient client = null; 
      NetworkStream stream = null; 
      byte[] buffer = null; 
      string receiveString = null; 
 
      IPAddress localIP = IPAddress.Parse("127.0.0.1"); 
      int localPort = 11000; 
      TcpListener listener = new TcpListener(localIP, localPort);//用本地IP和端口實例化Listener 
      listener.Start();//開始監(jiān)聽 
      while (true) 
      { 
        client = listener.AcceptTcpClient();//接受一個Client 
        buffer = new byte[client.ReceiveBufferSize]; 
        stream = client.GetStream();//獲取網(wǎng)絡(luò)流 
        stream.Read(buffer, 0, buffer.Length);//讀取網(wǎng)絡(luò)流中的數(shù)據(jù) 
        stream.Close();//關(guān)閉流 
        client.Close();//關(guān)閉Client 
 
        receiveString = Encoding.Default.GetString(buffer).Trim('\0');//轉(zhuǎn)換成字符串 
        Console.WriteLine(receiveString); 
      } 
    } 

static void Main(string[] args) 
    { 
      string sendString = null;//要發(fā)送的字符串 
      byte[] sendData = null;//要發(fā)送的字節(jié)數(shù)組 
      TcpClient client = null;//TcpClient實例 
      NetworkStream stream = null;//網(wǎng)絡(luò)流 
 
      IPAddress remoteIP = IPAddress.Parse("127.0.0.1");//遠(yuǎn)程主機IP 
      int remotePort = 11000;//遠(yuǎn)程主機端口 
 
      while (true)//死循環(huán) 
      { 
        sendString = Console.ReadLine();//獲取要發(fā)送的字符串 
        sendData = Encoding.Default.GetBytes(sendString);//獲取要發(fā)送的字節(jié)數(shù)組 
        client = new TcpClient();//實例化TcpClient 
        try 
        { 
          client.Connect(remoteIP, remotePort);//連接遠(yuǎn)程主機 
        } 
        catch (System.Exception ex) 
        { 
          Console.WriteLine("連接超時，服務(wù)器沒有響應(yīng)！");//連接失敗 
          Console.ReadKey(); 
          return; 
        } 
        stream = client.GetStream();//獲取網(wǎng)絡(luò)流 
        stream.Write(sendData, 0, sendData.Length);//將數(shù)據(jù)寫入網(wǎng)絡(luò)流 
        stream.Close();//關(guān)閉網(wǎng)絡(luò)流 
        client.Close();//關(guān)閉客戶端 
      } 
    } 

static void Main(string[] args) 
    { 
      UdpClient client = null; 
      string receiveString = null; 
      byte[] receiveData = null; 
      //實例化一個遠(yuǎn)程端點，IP和端口可以隨意指定，等調(diào)用client.Receive(ref remotePoint)時會將該端點改成真正發(fā)送端端點 
      IPEndPoint remotePoint = new IPEndPoint(IPAddress.Any, 0); 
 
      while (true) 
      { 
        client = new UdpClient(11000); 
        receiveData = client.Receive(ref remotePoint);//接收數(shù)據(jù) 
        receiveString = Encoding.Default.GetString(receiveData); 
        Console.WriteLine(receiveString); 
        client.Close();//關(guān)閉連接 
      } 
    } 

static void Main(string[] args) 
    { 
      string sendString = null;//要發(fā)送的字符串 
      byte[] sendData = null;//要發(fā)送的字節(jié)數(shù)組 
      UdpClient client = null; 
 
      IPAddress remoteIP = IPAddress.Parse("127.0.0.1"); 
      int remotePort = 11000; 
      IPEndPoint remotePoint = new IPEndPoint(remoteIP, remotePort);//實例化一個遠(yuǎn)程端點 
 
      while (true) 
      { 
        sendString = Console.ReadLine(); 
        sendData = Encoding.Default.GetBytes(sendString); 
 
        client = new UdpClient(); 
        client.Send(sendData, sendData.Length, remotePoint);//將數(shù)據(jù)發(fā)送到遠(yuǎn)程端點 
        client.Close();//關(guān)閉連接 
      } 
    }