问当一组特定的情况为真时，我如何定义一个事件发生？

EN

class Program
{
    private delegate void MyDelegate();

    private static bool FirstBool { get; set; }
    private static bool SecondBool { get; set; } 

    static void Main(string[] args)
    {
        FirstBool = false;
        SecondBool = false;

        MyDelegate firstDelegate = new MyDelegate(FirstMethod);
        MyDelegate secondDelegate = new MyDelegate(SecondMethod);

        AsyncCallback myCallback = new AsyncCallback(CallbackMethod);

        firstDelegate.BeginInvoke(myCallback, "Zip");
        secondDelegate.BeginInvoke(myCallback, "Line");

        Console.ReadLine();
    }

    private static void CallbackMethod(IAsyncResult result)
    {
        switch (result.AsyncState.ToString())
        {
            case "Zip":
                FirstBool = true;
                break;
            case "Line":
                SecondBool = true;
                break;
        }

        Console.WriteLine("Callback Method");
    }

    private static void FirstMethod()
    {
        Console.WriteLine("First Method");
    }

    private static void SecondMethod()
    {
        Console.WriteLine("Second Method");
    }
}