java与c#的socket通信问题！求解答呀

本人做了个Java与C#进行Socket通信程序,使用java做了个客户端,C#做了个服务器端,两个程序进行Socket连接成功,客户端发送的数据服务器端可以收到,但服务器端返回数据时,客户端却收不到哦   ?     这是怎么回事啊   ?请高手指点 
java：import java.io.*;   
import java.net.*;   public class myclass {

public static void main(String[] args)throws IOException
{
System.out.println("ready to test!\n");
run("127.0.0.1",33333);
}


public static void run(String hostip,int hostport)
{
  try
  {
  Socket server = null;
  String str = "this is amazing!";//null;
  
  server = new Socket(hostip,hostport);
  System.out.println("Connecting server\n"); /*   OutputStream outstrm = server.getOutputStream();   
  DataOutputStream dos = new DataOutputStream(outstrm);
  dos.writeUTF(str);
  dos.flush();
  dos.close();
*/  
  
  
  InputStream instrm = server.getInputStream();
  DataInputStream dis =new DataInputStream(instrm);   
  System.out.println("utf !!!\n");
  System.out.println(dis.readUTF());
  dis.close();
  server.close();
  }
  catch(IOException ex)
  {
   System.out.println(ex.toString());
  }
}
}c#：using System;
using System.Collections.Generic;
using System.Text;
using System.Net;
using System.Net.Sockets;
using System.Threading;
using System.Collections;
namespace GPSServer
{
    class Program
    {
        private static Thread mythread;
     //   private static IPAddress serverIP = IPAddress.Parse("192.168.200.130");
        private static IPEndPoint ipep;
        private static Socket server;
        static void Main(string[] args)
        {
            mythread = new Thread(new ThreadStart(BeginListen));
            Console.WriteLine("监听");
            mythread.Start();
            Console.WriteLine("线程启动");
        }        private static void BeginListen()
        {
            int recv;
            ipep = new IPEndPoint(IPAddress.Any, 33333);
            server = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
            Console.WriteLine("已创建");
            server.Bind(ipep);
            byte[] data = new byte[1024];
            while (true)
            {
                try
                {
                    server.Listen(10);
                    Console.WriteLine("开始监听");
                    Socket client = server.Accept();
                    Console.WriteLine("为连接创建新socket完毕");
               /*     recv=client.Receive(data);
                    Console.WriteLine("接收完毕 "+recv);
                    string tem=Encoding.UTF8.GetString(data, 0, recv);
                    char[] tem2 = new char[recv];
                   // Console.WriteLine(tem.Length);
                    for (int i = 2; i < tem.Length; i++)
                        tem2[i-2] = tem[i ];
                    Console.WriteLine(tem2);
                        if ("quite" == Encoding.UTF8.GetString(data, 0, recv))
                            break;                    //to be discussed!*/
                    Console.WriteLine("please enter a sentence:---");
                    string input = "hello world!";//Console.ReadLine();
                    client.Send(Encoding.ASCII.GetBytes(input));
                    Console.WriteLine("finished!\n");
                    Console.ReadKey();
                }
                catch (Exception ex)
                {
                    Console.WriteLine(ex.ToString());
                }
            }
            server.Close();
        }    }
}