using System;
using System.Collections.Generic;
using System.Text;
using System.Net;
using System.Net.Sockets;

namespace socketclient
{
    class Program
    {
        static void Main(string[] args)
        {
            Socket Client= new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.IP); //建立客户端套接字
            IPAddress adr = IPAddress.Parse("127.0.0.1");
            IPEndPoint ep = new IPEndPoint(adr, 3000);
            Server.Connect(ep); //完成绑定
            byte[] buffer = new byte[255];
            String data = null;
            int recv = 0;
            recv = Server.Receive(buffer);
            if (recv > 0)
            {
                Console.WriteLine("连接上...");
                Console.WriteLine("从服务器接收数据...");
                data = Encoding.ASCII.GetString(buffer, 0, recv);
                Console.WriteLine(data);
                while (true)
                {
                    String input;
                    input = Console.ReadLine();
                    if (input == "exit")
                    {
                        break;
                    }
                    Server.Send(Encoding.ASCII.GetBytes(input));
                }
                Console.WriteLine("连接断开...");
                Server.Shutdown(SocketShutdown.Both);
                Server.Close();
            }
        }
    }
}
在客户端的代码完成后运行出现了这样的问题，那位大虾来指点一下啊  我用的VS05 
No connection could be made because the target machine actively refused it 127.0.0.1:3000