问如果我在不同的线程上同步运行，会不会导致每次运行都是异步的？

EN

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Net;
using System.Net.Sockets;
using System.Threading;
using System.Runtime.Remoting.Messaging;

namespace CSharp_Console_Application
{
    class Program
    {
        delegate Socket GetClients();
        static GetClients newClients;
        static List<Socket> clients;

        static ManualResetEvent allDone = new ManualResetEvent(false);

        static void Main(string[] args)
        {
            IPEndPoint serverIPEP = new IPEndPoint(IPAddress.Any, 9080);
            Socket serverSocket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
            serverSocket.Bind(serverIPEP);
            serverSocket.Listen(10);

            Console.WriteLine("Waiting for connections...");

            clients = new List<Socket>();

            newClients = () =>
                {
                    Socket clientSocket = serverSocket.Accept();
                    IPEndPoint clientIPEP = (IPEndPoint)clientSocket.RemoteEndPoint;

                    Console.WriteLine("Connected to {0}.", clientIPEP);

                    clients.Add(clientSocket);

                    SendString("Welcome to my server!", clientSocket);
                    return clientSocket;
                };

            while (true)
            {
                allDone.Reset();

                newClients.BeginInvoke((itfAR) =>
                    {
                        allDone.Set();

                        AsyncResult ar = (AsyncResult)itfAR;
                        GetClients invokedDelegate = (GetClients) ar.AsyncDelegate;

                        Socket clientSocket = invokedDelegate.EndInvoke(itfAR);
                        IPEndPoint clientIPEP = (IPEndPoint)clientSocket.RemoteEndPoint;

                        Console.WriteLine("Sent 'Welcome!' to {0}.", clientIPEP);

                        string currentString = "";
                        while (true)
                        {
                            currentString += ReceiveString(clientSocket);
                            if (currentString.Contains('\n'))
                            {
                                Console.Write(clientIPEP + " said: " + currentString);

                                List<Socket> clientsWithoutThis = new List<Socket>();
                                clientsWithoutThis.AddRange(clients);
                                clientsWithoutThis.Remove(clientSocket);
                                SendToAll(clientsWithoutThis, currentString);

                                currentString = "";
                            }
                        }
                    },
                    null);

                allDone.WaitOne();
            }
        }

        static void SendToAll(List<Socket> clients, string message)
        {
            byte[] data = new byte[1024];
            clients.ForEach(clientSocket =>
                {
                    IPEndPoint clientIPEP = (IPEndPoint)clientSocket.RemoteEndPoint;
                    data = Encoding.ASCII.GetBytes(clientIPEP + " said: " + message + "\r");
                    clientSocket.Send(data, data.Length, SocketFlags.None);
                });
        }

        static void SendString(string message, Socket clientSocket)
        {
            byte[] data = new byte[1024];
            data = Encoding.ASCII.GetBytes(message + "\n\r");
            clientSocket.Send(data, data.Length, SocketFlags.None);
        }

        static string ReceiveString(Socket clientSocket)
        {
            byte[] data = new byte[1024];
            int recv = clientSocket.Receive(data, data.Length, SocketFlags.None);

            if (recv < 1)
                return null;

            string receivedString = Encoding.ASCII.GetString(data, 0, recv);
            return receivedString;
        }
    }
}