Overview of ADO.NET architecture

The most important section in ADO.NET architecture is “Data Provider”. Data Provider
provides access to datasource (SQL SERVER, ACCESS, ORACLE).In short it provides
object to achieve functionalities like opening and closing connection, retrieve data and update data. In the below figure you can see the four main sections of a data provider :-

Connection.
Command object (This is the responsible object to use stored procedures)
Data Adapter (This object acts as a bridge between datastore and dataset).
Data Adapter (This object acts as a bridge between datastore and dataset).

Dataset object represents disconnected and cached data. If you see the diagram it is not in direct connection with the data store (SQL SERVER, ORACLE etc) rather it talks
with Data adapter, who is responsible for filling the dataset. Dataset can have one or more Datatable and relations.