The application's main form, "Form1," is in the Presentation layer. Since Form1 is part of the Presentation layer it must access the business layer through its interface (see Figure 4).
应用的主窗体，“Form1”位于表现层，它必须通过其接口访问业务层(如图4)。
Changes to the data layer update the presentation layer, just as changes to the presentation layer will update the data layer.
对数据层的修改会更新表示层，对表示层的修改也会更新数据层。
Changes to the data layer update the presentation layer, just as changes to the presentation layer will update the data layer.
对数据层的修改会更新表示层，对表示层的修改也会更新数据层。
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