c# 创建socket客户端

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Net.Sockets;

namespace ConsoleApplication5
{
    class Program
    {
        static void Main(string[] args)
        {
            Socket s = new Socket(SocketType.Stream, ProtocolType.Tcp);
            String host = "qq.com";
            int port = 80;
            byte[] buf = null;

            s.Connect(host, port);

            string text = "hi";

            buf = Encoding.Default.GetBytes(text);
            int len = s.Send(buf);

            buf = new byte[1024];
            len = s.Receive(buf);

            string resp = Encoding.Default.GetString(buf);
            s.Close();

            System.Console.WriteLine(resp);

            System.Console.ReadKey();
        }
    }
}