C# / .NET equivalent to JavaScript setTimeout() / setInterval() timers

A single Timer class (System.Timers) handles the functionality you get from JavaScript's setInterval() and setTimeout() functions. You can use System.Threading, but Timer is simpler and sufficient for most tasks. To be able to clear it, declare it in the right scope (at the class level, typically). // Declare a timer: same steps in C# and VB Timer tmr = new Timer();
When you are ready to start the timer, set its interval (in milliseconds) and handler method: tmr.Interval = 100; // 0.1 second tmr.Tick += timerHandler; // We'll write it in a bit tmr.Start(); // The countdown is launched!
Food for thought - think about JavaScript: setTimeout() is a one-time timer that automatically clears itself (unless you call clearTimeout() before it ends), while setInterval() keeps running until you manually call clearInterval() - manual clearing is basically the only difference.
Here's the handler method: if you go for a timeout, clear the timer right then; otherwise, let it run. private void timerHandler(object sender, EventArgs e) { MessageBox.Show("Here's something to do..."); tmr.Stop(); // Manually stop timer, or let run indefinitely }
Tip: see if the timer is currently running with Timer.Enabled (boolean / set to false to disable).
And that's it! For a practical example, see postponing a focus change to deselect a ComboBox.

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