Socket中抛出下面异常是什么情况，求大神指导

private void button1_Click(object sender, EventArgs e)
{
//try
//{
//当点击开始监听的时候，在服务器端创建一个负责监听IP地址和端口号的Socket
Socket socketWatch = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
IPAddress ip = IPAddress.Any; //IPAddress.Parse(textBox1.Text);
//创建端口对象
IPEndPoint endPoint = new IPEndPoint(ip, Convert.ToInt32(txtPort.Text));
socketWatch.Bind(endPoint);
ShowMsg("监听成功！");
socketWatch.Listen(10);
Thread th = new Thread(Listen);
th.IsBackground = true;
th.Start(socketWatch);

        //}
        //catch { }
    }

    void Listen(object o)
    {
        Socket socketWatch = o as Socket;
        while (true)
        {
            //try
            //{
                //等待客户端的链接  并创建一个负责通讯的Socket
                Socket socketSend = socketWatch.Accept();
                ShowMsg(socketWatch.RemoteEndPoint.ToString() + "：链接成功！");
                Thread th = new Thread(Recive);
                th.IsBackground = true;
                th.Start(socketSend);
            //}
            //catch { }
        }
    }

    void Recive(object o)
    {
        Socket socketSend = o as Socket;
        byte[] buffer = new byte[1024 * 1024 * 5];
        while (true)
        {
            int i = socketSend.Receive(buffer);
            if (i == 0)
            {
                break;
            }
        }
    }

    private void ShowMsg(string str)
    {
        txtLog.AppendText(str + "\r\n");
    }

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