如果有改变的必要的话，最好的切换方式应该是怎样的？
If it is a necessary change, what is the best way to switch over?
如果用户改变了文本框中的值或切换了下拉列表中的选定元素，您就能够注册一个事件处理程序，引发事件时，执行代码。
If the user changes the value in a textbox or switches the selected element in a dropdown list, you can register an event handler and have code execute when the event is raised.
这种小但重要的工作方式的改变会立即使您获益：当您切换任务时，您在工作中建立起来的所有有价值的上下文不再会丢失。
This small but significant change in the way you work yields an immediate benefit: all the valuable context you build up as you work is no longer lost when you switch tasks.
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