DataSet has a collection of DataTable objects within the Tables collection. Each DataTable object contains a collection of DataRow objects and a collection of DataColumn objects. There are also collections for primary keys, constraints, and default values used in this table, which is called as constraint collection, and the parent and child relationships between the tables. Finally, there is a DefaultView object for each table. This is used to create aDataView object based on the table, so that the data can be searched, filtered, or otherwise manipulated while displaying the data.
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