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Throughout Chapter 1, you learned about the existence of the components available as two distinct groups in ADO .NET. There is the group of components that allows connection to and interaction with data sources and another group that provides client manipulation of data.
This chapter is about the first aforementioned group of components that provides an interface to the data source. A complete reference is provided on the following components:
Connection
Command
DataReader
DataAdapter
As covered in Chapter 1, all .NET data providers must implement interfaces to all these components. Figure 2-1 shows the relationship of these components inside a .NET data provider. In this chapter, we will cover each of these components as they are implemented in the two original data providers shipped with the .NET Framework (SQL Server .NET Data Provider and OLE DB .NET Data Provider).
This chapter is very conceptual and organized as a reference volume to the above objects. After learning about the concepts in this chapter, you will be provided with an overview of how everything fits together in a practical programming environment in Chapter 5.
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