The datatable class

The UniqueConstraint Class You use an object of the UniqueConstraint class to ensure that a DataColumn value, or combination of DataColumn values, is unique for each DataRow in a DataTable.

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The ForeignKeyConstraint Class You use an object of the ForeignKeyConstraint class to represent a foreign key constraint between two DataTable objects.

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The DataTable Class You use an object of the DataTable class to represent a table. You can also store multiple DataTable objects in a DataSet. Table 11.1 shows some of the DataTable properties.

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The output from this program is as follows: numberOfRows = 3 Reading from the Products DataTable ProductID = 1 ProductName = Chai UnitPrice = 18 ProductID

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The DataRow Class You use an object of the DataRow class to represent a row. You can also store multiple DataRow objects in a DataTable. Table 11.4 shows some of the DataRow properties.

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