Step 3: Adding Field-Level Validation to the DataRow classes.

第三步：给DataRow添加字段级验证。

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Unfortunately the strongly-typed DataRow classes generated by Visual Studio do not use nullable types.

不幸的是，VisualStudio生成的强类型数据集（strongly-typed DataRow）并没有使用nullable values。

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The class file actually contains a series of classes that inherit from and extend the DataSet, DataTable, DataRow, and EventArgs classes.

该类文件实际上包含一系列类，这些类继承并扩展了DataSet、DataTable、DataRow和eventargs类。

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Therefore, manually putting the passed in values back into a DataRow helps ensure the validity of the data being passed to the BLL method.

因此，我们应该手工的验证一下传入的参数以保证传递给BLL方法的数据是有效的。

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Therefore, manually putting the passed in values back into a DataRow helps ensure the validity of the data being passed to the BLL method.

因此，我们应该手工的验证一下传入的参数以保证传递给BLL方法的数据是有效的。

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