multithread c# soscket server

Question

Hello: I write a multithread c# socket server,it is a winform application,there is a richtextbox control and button,when the button is click,the server begin to listen the socket port,waiting for a incoming connection,the relative code snipprt as following:: private IPAddress myIP=IPAddress.Parse("127.0.0.1"); private IPEndPoint myServer; private Socket socket; private Socket accSocket; private System.Windows.Forms.Button button2; private bool check; private void button1_Click(object sender, System.EventArgs e) { check=true; try { Thread thread =new Thread(new ThreadStart(accp)); thread.Start(); } catch(Exception ee) { MessageBox.Show(ee.Message); } } private void accp() { myServer=new IPEndPoint(myIP,Int32.Parse("20000")); socket=new Socket(AddressFamily.InterNetwork,SocketType.Stream,ProtocolType.Tcp); socket.Bind(myServer); socket.Listen(50); while(true) { try { accSocket=socket.Accept(); if(accSocket.Connected) { Thread thread=new Thread(new ThreadStart(round)); thread.Start(); } } catch(Exception ee) { MessageBox.Show(ee.Message); } } } private void round() { Byte[] rec=new Byte[1024]; NetworkStream acceptStream=new NetworkStream(accSocket); int i=0; while((i=acceptStream.Read(rec,0,rec.Length))!=0) { string recMessage=System.Text.Encoding.Default.GetString(rec); rec=new Byte[1024]; this.richTextBox1.AppendText(recMessage); } } ………………………………………. ……………………………………… In order to test the server,I write a multithread client too,there is only one button in the form,when it is clicked,four threads is generated to connect the server simultaneously,each thread write one line to the server socket.code as: private IPAddress myIP; private IPEndPoint myServer; private Socket socket; private void button1_Click(object sender, System.EventArgs e) { for(int i=0;i<4;i++) { Thread thread=new Thread(new ThreadStart(round)); thread.Start(); thread.Join(); } } private void round() { try { myIP=IPAddress.Parse("127.0.0.1"); myServer=new IPEndPoint(myIP,Int32.Parse("20000")); socket=new Socket(AddressFamily.InterNetwork,SocketType.Stream,ProtocolType.Tcp); socket.Connect(myServer); NetworkStream netStream=new NetworkStream(socket); Byte[] byteMessage=new Byte[640]; string sendMessage="???!!!!!\r\n"; byteMessage=System.Text.Encoding.Default.GetBytes(sendMessage.ToCharArray()); // socket.Send(byteMessage,byteMessage.Length,0); netStream.Write(byteMessage,0,byteMessage.Length); netStream.Flush(); netStream.Close(); socket.Close(); } catch(Exception ee) { MessageBox.Show(ee.Message); } } As you can see,when I click the button in the client side,I should see four lines is printed in the server side.but in fact,I can’t,I can only see one line,sometimes two or three lines,by my tracing,I found they always come from the last several threads.if I modify the button click event in the client as following(add sleep between the threads),it works well,that is I can see four lines every time in the server: private void button1_Click(object sender, System.EventArgs e) { for(int i=0;i<4;i++) { Thread thread=new Thread(new ThreadStart(round)); thread.Start(); thread.Join(); Thread.Sleep(100); } } If I modify the timeout param of the sleep method to lower and lower, the mentioned problem occur again.i also write a java multithread server, it works well to the simuteneous thread connection. Why c# socket server can’t handle the simultaneous access?is it a bug?by comparing the java server and c# server,I also found that the java server is faster then c# server. Any instruction?Thank you.