datatables
datatables-
The DataTables can be related by primary and foreign keys .
DataTable可以通过主键和外键相关联。
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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 .
我们可以在数据集设计器（DataSetDesigner）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。