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

Sleep will do the trick, Timer on the other hand has been designed for that exact purpose, conventions are better and they will usually make your code more understandable.

Answer 2

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();
    }

Answer 3

Do you realize that fooUsingSleep is calling itself over and over? It will eventually generate a stack overflow.

If you are using timer, it can be as simple as this:

    System.Windows.Forms.Timer t = new System.Windows.Forms.Timer();
    t.Interval = 3000;
    t.Tick += new EventHandler((o,ea) => Console.WriteLine("foo"));