I have a counter that counts up every 1 second and add 1 to an int. Question How can I format my string so the counter would look like this: 00:01:23 Instead of: 123 Things I've tried Things I've tried so far: for (int i = 0; i < 1; i++) { _Counter += 1; labelUpTime.Text = _Counter.ToString(); } My timer's interval is set to: 1000 (so it adds 1 every second). I did read something about string.Format(""), but I don't know if it is applicable. Thanks if you can guide me through this :D!