C# socket 异步收发问题
我想实现一个简单的C/S版的聊天室，客户端向服务器发送一个信息，服务器接收到后返回一个同样的消息，
我下面的代码只能向服务器发送信息，但是收不到服务器返回的消息。请高手帮我看看，指点一下。
///ServerForm

C# code

using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Text;using System.Windows.Forms;using System.Net;using System.Net.Sockets;namespace ChatServer{    public partial class Form1 : Form    {        Socket s;        byte[] msg = new byte[1024];        public Form1()        {            InitializeComponent();        }        private void Form1_Load(object sender, EventArgs e)        {            int port = 1000;            IPAddress ip = IPAddress.Parse("127.0.0.1");            IPEndPoint ipe = new IPEndPoint(ip, port);            s = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);            s.Bind(ipe);            s.Listen(5);            s.BeginAccept(new AsyncCallback(OnAccept), null);        }        private void OnAccept(IAsyncResult ar)        {            Socket cs = s.EndAccept(ar);            s.BeginAccept(new AsyncCallback(OnAccept), null);            msg = new byte[1024];            cs.BeginReceive(msg, 0, msg.Length, SocketFlags.None, new AsyncCallback(OnReceive), cs);        }        private void OnReceive(IAsyncResult ar)        {            Socket cs = (Socket)ar.AsyncState;            cs.EndReceive(ar);            cs.BeginSend(msg, 0, msg.Length, SocketFlags.None, new AsyncCallback(OnSend), cs);            string strTemp = Encoding.GetEncoding("gb2312").GetString(msg) + "\r\n";            cs.BeginReceive(msg, 0, msg.Length, SocketFlags.None, new AsyncCallback(OnReceive), cs);            this.richTextBox1.Text += strTemp;        }        private void OnSend(IAsyncResult ar)        {            ((Socket)ar.AsyncState).EndSend(ar);        }    }}

///clientForm

C# code

using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Text;using System.Windows.Forms;using System.Net;using System.Net.Sockets;namespace ChatClient{    public partial class Form1 : Form    {        Socket cs;        byte[] msg;        public Form1()        {            InitializeComponent();        }        private void button1_Click(object sender, EventArgs e)        {            msg = new byte[1024];            msg = Encoding.GetEncoding("gb2312").GetBytes(textBox1.Text);            cs.BeginSend(msg, 0, msg.Length, SocketFlags.None, new AsyncCallback(OnSend), null);        }        private void OnConnect(IAsyncResult ar)        {            cs.EndConnect(ar);            byte[] strSend = new byte[1024];            string strTemp = "请求连接！";            strSend = System.Text.Encoding.GetEncoding("gb2312").GetBytes(strTemp);            cs.BeginSend(strSend, 0, strSend.Length, SocketFlags.None, new AsyncCallback(OnSend), null);        }        private void OnSend(IAsyncResult ar)        {            cs.EndSend(ar);        }        private void Form1_Load(object sender, EventArgs e)        {            cs = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);            IPEndPoint ipe = new IPEndPoint(IPAddress.Parse("127.0.0.1"), 1000);            cs.BeginConnect(ipe, new AsyncCallback(OnConnect), null);            msg = new byte[1024];            cs.BeginReceive(msg, 0, msg.Length,  SocketFlags.None,new AsyncCallback(OnReceive), null);        }        private void OnReceive(IAsyncResult ar)        {            cs.EndReceive(ar);            msg = new byte[1024];            cs.BeginReceive(msg,0,msg.Length,SocketFlags.None,new AsyncCallback(OnReceive),null);            string strMsg = Encoding.GetEncoding("gb2312").GetString(msg);            this.richTextBox1.Text += strMsg + "/r/n";        }    }} 
 

[解决办法]
private void OnReceive(IAsyncResult ar)
{
cs.EndReceive(ar);
msg = new byte[1024];
cs.BeginReceive(msg,0,msg.Length,SocketFlags.None,new AsyncCallback(OnReceive),null);
string strMsg = Encoding.GetEncoding("gb2312").GetString(msg);
this.richTextBox1.Text += strMsg + "/r/n";
}
==================

private void OnReceive(IAsyncResult ar)
{ string strMsg = Encoding.GetEncoding("gb2312").GetString(msg);
this.richTextBox1.Text += strMsg + "/r/n";
cs.EndReceive(ar);
msg = new byte[1024];
cs.BeginReceive(msg,0,msg.Length,SocketFlags.None,new AsyncCallback(OnReceive),null);

}