如何让线程等待，直到另一个线程等待(C#)

using System;
using System.Threading;

class Program
{
    static ManualResetEvent waitHandle = new ManualResetEvent(false);

    static void Main(string[] args)
    {
        Thread thread1 = new Thread(DoWork);
        Thread thread2 = new Thread(WaitForThread1);

        thread1.Start();
        thread2.Start();

        // 主线程等待一段时间后，发送信号给thread1
        Thread.Sleep(2000);
        waitHandle.Set();

        thread1.Join();
        thread2.Join();
    }

    static void DoWork()
    {
        Console.WriteLine("Thread 1 is doing some work...");
        // 等待信号
        waitHandle.WaitOne();
        Console.WriteLine("Thread 1 continues its work...");
    }

    static void WaitForThread1()
    {
        Console.WriteLine("Thread 2 is waiting for Thread 1...");
        // 等待信号
        waitHandle.WaitOne();
        Console.WriteLine("Thread 2 continues its work...");
    }
}