我们可以在数据集设计器(DataSet Designer)中看到已经存在的字段级验证，从某个DataTable中选择一个字段，然后在属性窗口中就可以找到了。

To see the existing field-level validation automatically provided, go to the DataSet Designer, select a field from one of the DataTables and then go to the Properties window.

youdao

选择该选项后，对于每个术语会添加一个字段，以便看到哪些术语仍然存在于当前版本的应用程序中。

Selecting this option adds a field for each term so that you can see which terms still exist in the current version of the application.

youdao

依我的经验，在一个字段中提供超过15或20个选择就有点令人讨厌了。

In my experience, offering more than 15 or 20 choices in a select field begins to get a bit cumbersome.

youdao