ADO.NET Architecture
ADO.NET is a set of classes that provide consistent access to multiple data sources, which may be either relational data from a database or hierarchical data expressed in XML. A driving factor in ADO.NET is a provision for disconnected access to data, which is much more scalable and flexible than the connection-oriented database access that is traditional in client/server systems.
The DataSet class is the central component of the disconnected architecture. A dataset can be populated from either a database or an XML stream. From the perspective of the user of the dataset, the original source of the data is immaterial. A consistent programming model is used for all application interaction with the DataSet.
The second key component ...
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