Материал из .Net Framework эксперт
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Using Disconnected Data Access
DataAdapter transfers data from the database to the in-memory database and back again.
DataTable represents an in-memory database table.
DataView represents an in-memory database view.
DataSet represents an in-memory database.
They are slower and use more resource intensive.
Retrieving 500 records with a DataReader is much faster than retrieving 500 records with a DataAdapter.
