What should I use Sleep or Timer

Question

I have two alternative using timer or using sleep, I need to call a method every 3 seconds after this method is finished, I wrote basic example to demonstrate what I mean:

Answer 1

The real context of your program matters too.

The sleep option 'wastes' a Thread, not a problem in a small console app but in general not a good idea.

You don't need to restart the timer, the following will keep ticking:

    static void Main(string[] args)
    {
        var t = new System.Timers.Timer(1000);
        t.Elapsed += (s, e) => CallMeBack();
        t.Start();

        Console.ReadLine();
    }