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Limitations of the Windows Forms Timer Component's Interval Property 

The Windows Forms Timer component has an Interval property that specifies the number of milliseconds that pass between one timer event and the next. Unless the component is disabled, a timer continues to receive the Tick event at roughly equal intervals of time.

This component is designed for a Windows Forms environment. If you need a timer that is suitable for a server environment, see Introduction to Server-Based Timers.

The Interval Property

The Interval property has a few limitations to consider when you are programming a Timer component:

  • If your application or another application is making heavy demands on the system — such as long loops, intensive calculations, or drive, network, or port access — your application may not get timer events as often as the Interval property specifies.

  • The interval can be between 1 and 64,767, inclusive, which means that even the longest interval will not be much longer than one minute (about 64.8 seconds).

  • The interval is not guaranteed to elapse exactly on time. To ensure accuracy, the timer should check the system clock as needed, rather than try to keep track of accumulated time internally.

  • The system generates 18 clock ticks per second — so even though the Interval property is measured in milliseconds, the true precision of an interval is no more than one-eighteenth of a second.

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