From ms-help://MS.VSCC.v80/MS.MSDN.v80/MS.VisualStudio.v80.en/dv_fxadvance/html/7091500d-be18-499b-a942-95366ce185e5.htm
Timers are lightweight objects that enable you to specify a delegate to be called at a specified time. A thread in the thread pool performs the wait operation.
Using the Timer class is straightforward. You create a Timer, passing a TimerCallback delegate to the callback method, an object representing state that will be passed to the callback, an initial raise time, and a time representing the period between callback invocations. To cancel a pending timer, call the Timer.Dispose function.
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There are two other timer classes. The System.Windows.Forms.Timer class is a control that works with visual designers and is meant to be used in user interface contexts; it raises events on the user interface thread. The System.Timers.Timer class derives from Component, so it can be used with visual designers; it also raises events, but it raises them on a ThreadPool thread. The System.Threading.Timer class makes callbacks on a ThreadPool thread and does not use the event model at all. It also provides a state object to the callback method, which the other timers do not. It is extremely lightweight. |
So that's nice and clear then.
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