无法使用readline()读取c#中的TCP套接字

我在C#中制作了一个简单的TCP客户端/服务器，但我遇到了问题。当我用telnet测试代码时，服务器正在读取套接字并写入结果。但是，当我的客户端在套接字上写句子时，服务器在readLine函数处被阻塞。

这是我的客户：

 public Boolean initConnection(String ip)
        {
            try
            {
              this.client.Connect("127.0.0.1", 40000);
              this.output = this.client.GetStream();
              this.reader = new StreamReader(this.output, Encoding.UTF8);
              this.writer = new StreamWriter(this.output, Encoding.UTF8);
              writer.Write("one sentence");
              return (true);
            }
          catch (Exception ex)
            {
                Console.WriteLine(ex.Message);
                return (false);
            }
        }

这里有我的服务器：

class SNetwork
    {
        private Thread Tread;
        private TcpListener server;
        private TcpClient client;
        private StreamReader reader;
        private StreamWriter writer;
        private NetworkStream output;
        private State state;
        public void initReading()
        {
            this.server = new TcpListener(IPAddress.Any, 40000);
            output = client.GetStream();
            reader = new StreamReader(output, Encoding.UTF8);
            writer = new StreamWriter(output, Encoding.UTF8);
            this.Tread = new Thread(new ThreadStart(this.read)); // this.Tread is a thread
            this.Tread.Start();
        }
   private void read()
        {
            try
            {
                while (Thread.CurrentThread.IsAlive)
                {
                    String result;
                    if (this.client.Client.Poll(10, SelectMode.SelectRead))
                    {
                        this.state = State.Closed;
                        break;
                    }
                    else
                    {
                        result = reader.ReadLine();
                        if (result != null && result.Length > 0)
                            Console.WriteLine(result);
                    }
                }
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.Message);
            }
        }
}

有人能帮我吗？我找不到解决方案

writer.Write("one sentence");