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Define the data provider classes that is supported by ADO.NET.

The .NET framework data provider includes the following components for data manipulation:

- Connection: Used for connectivity to the data source
- Command: This executes the SQL statements needed to retrieve data, modify data or execute stored procedures. It works with connection object.
- DataReader: This class is used to retrieve data. DataReader is forward only and read-only object. We cannot modify the data using DataReader.
- DataAdapter: It works as bridge between dataset and data source. Datadapter uses fill method to load the dataset.

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