Snippet highlighting the socket server

Server.cs

public void RunTcpServer()
{
    while (_running)
    {
        _listener.Start();
        DoBeginAcceptTcpClient(_listener);
        _writer = new StreamWriter(_client.GetStream());
        _reader = new StreamReader(_client.GetStream());
        try
        {
            //Client has requested an action
            string requestRaw = _reader.ReadLine();
            string[] delim = { @"\|/" };
            string[] request = requestRaw.Split(delim, StringSplitOptions.None);

            //Check if API key is valid
            if (Config.GetApiKeys().Contains(request[0]))
            {
                //Valid API key sent
                Commands.Command command = (Commands.Command)Enum.Parse(typeof(Commands.Command), request[1]);
                List<string> output = Commands.RunCommand(command);
                foreach (string line in output)
                {
                    _writer.WriteLine(line);
                }

                //Send data back to client
                _writer.Flush();
            }
            else
            {
                //API key was not found in the list
                _writer.WriteLine("API Key Not Valid");

                //Send data back to client
                _writer.Flush();
            }
        }
        catch (Exception e)
        {
            _logger.LogError("Invalid command received");
            _writer.Write("Invalid command received");
            _writer.Flush();
            _client.Close();
            break;
        }
        _writer.Flush();
        _client.Close();
        _listener.Stop();
    }
}

private void DoBeginAcceptTcpClient(TcpListener listener)
{
    _clientConnected.Reset();
    listener.BeginAcceptTcpClient(DoAcceptTcpClientCallback, listener);
    _clientConnected.WaitOne();
}

private void DoAcceptTcpClientCallback(IAsyncResult ar)
{
    try
    {
        _listener = (TcpListener)ar.AsyncState;
        _client = _listener.EndAcceptTcpClient(ar);
        _clientConnected.Set();
    }
    catch (ObjectDisposedException e)
    {
        //intentionally empty catch
    }
}