Stopwatch that counts down in C#

Question

I've seen variations of this by googling it but I have a windows form with a timer control, three textboxes (hour, minute, second) and based on a button being clicked, I want to count down from 2 hours. So right after clicking textbox1 (hour) will be 1, textBox2 (minute) will be 59, textBox3 (second) will be 59 and they will all continue to count down until all read 0.

Does anyone have some code to share for that?

Many thanks.

Answer 1

Extract the components from a TimeSpan. Record the current time and date as soon as the button is clicked, and store that in a variable. Then, every second your timer should calculate the duration since the start time.

IE: DateTime result = DateTime.Now.Subtract(StartingTime);

Then, use the parts of the resulting TimeSpan to populate the fields.

IE: int Hour = result.Hour; (or something like that).

Addendum: Don't count down manually every second, because this is likely to cause the countdown to be inaccurate.

Answer 2

You can use the TimeSpan class. Initialize of to 2 hours. If you start the Timer get the current timer. Then with a Timer object refresh your display every second. Simply get the current Time. So the remaining time is:

TimeSpan remaining = twoHoursTimespan - (CurrentTime - StartTime);