private void StartListening()
        {
            MessageBox.Show("1");
            Socket tempSocket = serverSocket.Accept();
            if (tempSocket != null)
            {
                MessageBox.Show("4");
                isConn = true;
            }
            MessageBox.Show("2");
            netWorkStream = new NetworkStream(tempSocket);
            streamReader = new StreamReader(netWorkStream);
            streamWriter = new StreamWriter(netWorkStream);
            while (isConn)
            {
                string str;
                try
                {
                    MessageBox.Show("5");
                    byte[] text = new byte[1024];
                    str = streamReader.ReadLine();//这里出现问题
                    MessageBox.Show("6");
                    if (str.Length != 0)
                    {
                        MessageBox.Show(str);
                    }                }
                catch (Exception ex)
                {
                    MessageBox.Show(ex.ToString());
                }            }        }