就像一个典型窗体程序里的其它代码一样，任何驻留在一个定时器事件处理函数(指的是该类型的定时器类)中的代码也是使用应用程序的UI线程所执行。

Just like the rest of the code in a typical Windows Forms application, any code that resides inside a timer event handler (for this type of timer class) is executed using the application's UI thread.

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为了最大限度的代码重用，三种不同类型的定时器事件都调用了同样的ShowTimerEventFired方法，下面就是三个定时器事件的处理函数。

To maximize code reuse, the sample application calls the same ShowTimerEventFired method from all three different types of timer events. Here are the three timer event handlers.

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本文的目的是要显示不同类型的定时器实际使用。

The goal of this article is to show the practical use of different kinds of timers.

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