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Scenario:
In a Winform application(C#), I have a Datagridview in which I have to display 4 countdown timers in the format “mm:ss”.
Time Interval must be 1000ms.
I was counting the timer down in the elapsed event of system.timers.timer.
On all 4 timers I’m starting to countdown from 2 mins (02:00).
Issue:
It takes more time(125 seconds) than 2 mins, to reach 00:00.
Similarly for 4 mins it takes 7-10 more(247 -250) seconds to reach 00:00
Timers on systems are somewhat of an inaccurate beast. Better systems generally provide better timers but even the best system has slippage.
You also need to remember that your process isn’t going to be in “full control” 100% of the time, it will at times be pushed into the background and have to share the processor with other applications so whilst it’s does its best to keep track of the time.
What you probably want is a High Precision Timer (aka stopwatch) in C#. Have a look at This thread and This article on selecting timer mechanisms for some more information.