客户端不知道它在winform中与C＃的服务器断开连接

Question

参考我之前的问题：Unable to do server reconnection after disconnected in C# winform。

以下是我的客户端与服务器建立连接的编码：

        private void timer1_Tick(object sender, EventArgs e)
    {
        DataProcess();
    }

    public Socket _serverSocket = null;
    private byte[] _recieveBuffer = new byte[128];
    void DataProcess()
    {
        //TimeSpan ts;
        try
        {
            //Thread.Sleep(100);
            if (_serverSocket == null || sockState == MySocketState.Disconnected)
            {
                Console.WriteLine("Trying to connect...");
                //ts = DateTime.Now.Subtract(_dLastActivity);

                //if (ts.TotalSeconds < 0 || ts.TotalSeconds > 10)
                //{
                //StartConnect();
                SetupServer();
                //}
            }
        }
        catch (Exception ex)
        {
            Console.WriteLine(ex.ToString());
        }
    }

    private void SetupServer()
    {
        try
        {
            _serverSocket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
            _serverSocket.Connect(_sIP, Int32.Parse(_sPort));
        }
        catch (SocketException ex)
        {
            Console.WriteLine(ex.Message);
        }

        if (_serverSocket.Connected)
        {
            sockState = MySocketState.Connected;
            browser.ExecuteScriptAsync("svrConnect();");
            Console.WriteLine("Server connected...");
            _serverSocket.BeginReceive(_recieveBuffer, 0, _recieveBuffer.Length, SocketFlags.None, new AsyncCallback(ReceiveCallback), null);
        }
    }

我做了一个timer_tick来不断尝试连接服务器。但后来发生了一种情况： 我尝试首先成功连接服务器，然后我拔掉LAN电缆以尝试模拟断开连接。它无法识别它已断开连接。它仍处于连接状态。什么都没有错误信息。然后我将LAN电缆插回，它无法再从服务器接收数据。我想也许需要再次重新连接。

我们如何让客户知道它已与服务器断开连接？