正在自动重新连接异步套接字客户端

我正在C#中使用一个windows窗体应用程序。我使用的是一个套接字客户端，它以异步方式连接到服务器。如果由于任何原因连接中断，我希望套接字立即尝试重新连接到服务器。我的接收程序看起来像这个

        public void StartReceiving()
    {
        StateObject state = new StateObject();
        state.workSocket = this.socketClient;
        socketClient.BeginReceive(state.buffer, 0, StateObject.BufferSize, 0, new AsyncCallback(OnDataReceived), state);
    }
    private void OnDataReceived(IAsyncResult ar)
    {
        try
        {
            StateObject state = (StateObject)ar.AsyncState;
            Socket client = state.workSocket;
            // Read data from the remote device.
            int iReadBytes = client.EndReceive(ar);
            if (iReadBytes > 0)
            {
                byte[] bytesReceived = new byte[iReadBytes];
                Buffer.BlockCopy(state.buffer, 0, bytesReceived, 0, iReadBytes);
                this.responseList.Enqueue(bytesReceived);
                StartReceiving();
                receiveDone.Set();
            }
            else
            {
                NotifyClientStatusSubscribers(false);
            }
        }
        catch (Exception e)
        {
        }
    }

当NotifyClientStatusSubscribers（false）被调用时，函数StopClient被执行：

public void StopClient()
    {
        this.canRun = false;
        this.socketClient.Shutdown(SocketShutdown.Both);
        socketClient.BeginDisconnect(true, new AsyncCallback(DisconnectCallback), this.socketClient);
    }
    private void DisconnectCallback(IAsyncResult ar)
    {
        try
        {
            // Retrieve the socket from the state object.
            Socket client = (Socket)ar.AsyncState;
            // Complete the disconnection.
            client.EndDisconnect(ar);
            this.socketClient.Close();
            this.socketClient = null;
        }
        catch (Exception e)
        {
        }
    }

现在我尝试通过调用以下函数重新连接：

    public void StartClient()
    {
        this.canRun = true;
        this.MessageProcessingThread = new Thread(this.MessageProcessingThreadStart);
        this.MessageProcessingThread.Start();
        this.socketClient = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
        this.socketClient.LingerState.Enabled = false;
    }
    public void StartConnecting()
    {
        socketClient.BeginConnect(this.remoteEP, new AsyncCallback(ConnectCallback), this.socketClient);
    }
    private void ConnectCallback(IAsyncResult ar)
    {
        try
        {
            // Retrieve the socket from the state object.
            Socket client = (Socket)ar.AsyncState;
            // Complete the connection.
            client.EndConnect(ar);
            // Signal that the connection has been made.
            connectDone.Set();
            StartReceiving();
            NotifyClientStatusSubscribers(true);
        }
        catch(Exception e)
        {
            StartConnecting();
        }
    }

当连接可用时，套接字会重新连接，但几秒钟后，我收到以下未处理的异常："在已连接的套接字上发出了连接请求。"

这怎么可能？