vs2005 C#与 PDA socket通信

Question

做一个PDA socket通信的东西，如下 Server端：vs2005 C# windows application 
一个按钮，起动监听，端口8000；一个listbox，显示客户端发来的字符client端：vs2005 C# windows CE device application
一个输Server IP地址的textbox；一个输message的textbox
一个Connet按钮，连接服务器；
                IPAddress ipRemote = IPAddress.Parse(textBox1.Text);
                IPEndPoint iep = new IPEndPoint(ipRemote, 8000);
                
                TcpClient tcpClient = new TcpClient();
                tcpClient.Connect(iep);
                nsStream = tcpClient.GetStream();
                swWriter = new StreamWriter(nsStream);                button1.Enabled = false;
                button2.Enabled = true;                tcpConnect = true;
                statusBar1.Text = "Connected!";
到这里没有问题。
一个Send按钮，发送字符
                try
                {
                    swWriter.WriteLine(textBox2.Text);
                    swWriter.Flush();
                }
                catch (Exception ex)
                {
                    MessageBox.Show(ex.ToString());
                }
这个按钮这一步 swWriter.Flush(); 出错！
System.IO.IOException:Unalbe to write data to the transport connection.
-->System.Net.Sockets.SocketException: An existing connection was forcibly colsed by the remote host 请教是什么缘故？要怎么解决啊？调试时，用ActiveSync连接windows mobile Pocket PC Emulator成功。
在Pocket PC Emulator窗口中跑出我的Client界面，点击Send按钮出错。（在vs2003下，以上都没有问题，能跑通的。用不到ActiveSync）

Answer 1

常见Socket通常异常！请LZ确认不在多线程同时打开N个连接

Answer 2

能否说的再具体点？server端代码主要是这样的：
        int port = 8000;
        private Thread thThreadRead;
        private TcpListener tlTcpListen;
        private bool blistener = true;
        private NetworkStream nsStream;
        private StreamReader srRead;
        private TcpClient tcClient;        private void button1_Click(object sender, EventArgs e)
        {
            thThreadRead = new Thread(new ThreadStart(Listen));
            thThreadRead.Start();
            button1.Enabled = false;
        }        public static IPAddress GetServerIP()
        {
            IPHostEntry ieh = Dns.GetHostByName(Dns.GetHostName());
            return ieh.AddressList[0];
        }        private void Listen()
        {
            try
            {
                IPAddress serverIp = GetServerIP();
                IPEndPoint iep = new IPEndPoint(serverIp, port);
                tlTcpListen = new TcpListener(iep);
                tlTcpListen.Start();
                SetText(serverIp.ToString() + ":" + port.ToString() + " is listening now!");
                tcClient = tlTcpListen.AcceptTcpClient();
                nsStream = tcClient.GetStream();
                srRead = new StreamReader(nsStream);
                SetText("Connected!");                while (blistener)
                {
                    string sMessage = srRead.ReadLine();
                    if (sMessage == "STOP")
                    {
                        tlTcpListen.Stop();
                        nsStream.Close();
                        srRead.Close();
                        SetText("connection is closed!");
                        thThreadRead.Abort();
                        return;
                    }                    string sTime = DateTime.Now.ToShortTimeString();
                    listBox1.Items.Add(sTime + " " + sMessage);                }            }
            catch (System.Security.SecurityException)
            {
                MessageBox.Show("listen is failure!", "Error");
            }        }
Client端主要如下：
        private StreamWriter swWriter;
        private NetworkStream nsStream;
        private TcpClient tcpClient;
        private bool tcpConnect = false;        private void button1_Click(object sender, EventArgs e)
        {
            IPAddress ipRemote;
            try
            {
                ipRemote = IPAddress.Parse(textBox1.Text);
            }
            catch
            {
                MessageBox.Show("IP address is invalid", "Error");
                return;
            }            IPHostEntry ipHost;
            try
            {
                ipHost = Dns.Resolve(textBox1.Text);
            }
            catch
            {
                MessageBox.Show("The host is not running!", "Error");
                return;
            }            string sHostName = ipHost.HostName;
            try
            {
                IPEndPoint iep = new IPEndPoint(ipRemote, 8000);
                TcpClient tcpClient = new TcpClient();
                tcpClient.Connect(iep);
                nsStream = tcpClient.GetStream();
                swWriter = new StreamWriter(nsStream);                button1.Enabled = false;
                button2.Enabled = true;                tcpConnect = true;
                statusBar1.Text = "Connected!";
            }
            catch(Exception ex)
            {
                MessageBox.Show(ex.ToString());
                return;
            }         }        private void button2_Click(object sender, EventArgs e)
        {
            if (textBox2.Text != "")
            {
                try
                {
                    swWriter.WriteLine(textBox2.Text);
                    swWriter.Flush();
                }
                catch (Exception ex)
                {
                    MessageBox.Show(ex.ToString());
                }
            }
            else
            {
                MessageBox.Show("The message is invalid!", "Error");
            }         }

Answer 3

换了台机子，可以跑了
------------------------------------------------------------------------
安装vs2005，
然后安装Virtual Machine Network Driver for Microsoft Device Emulator
http://www.microsoft.com/downloads/details.aspx?familyid=DC8332D6-565F-4A57-BE8C-1D4718D3AF65&displaylang=en
装好后，网上邻居的本地连接属性里钩上Virtual Machine Network Driver 
就可以跑了，，不需要ActiveSync，Windows Mobile 5.0 Pocket PC SDK和Windows Mobile 5.0 Emulator Images for Pocket PC。调试时选Pocket PC 2003 SE Emulator，出现虚拟机画面的时候，[文件]-[构成]，[网络]里会有Virtual Machine Network Driver，钩上。多谢！