Can you give an overview of ADO.NET architecture?
The most important part in the ADO.NET architecture is the "Data Provider". The Data Provider provides access to the datasource ( ACCESS, ORACLE, SQL SERVER).In brief it gives the object to achieve functionalities such as opening and closing connection, update data and retrieve data . In the below shown figure you can see the 4 main parts of a data provider :-
The Dataset object shows the disconnected and cached data. If you see the diagram it is not in the direct connection with the data store (ORACLE, SQL SERVER etc) rather it talks with the Data adapter, who is responsible for filling the dataset. The Dataset can have one or more Data table and relations.