Disconnected Data Access
The ADO.NET Framework supports two models of data access. In the first part of this chapter, you saw how you can use the SqlConnection, SqlCommand, and SqlDataReader objects to connect to a database and retrieve data. When you read data from a database by using a SqlDataReader object, an open connection must be maintained between your application and the database.
In this section, we examine the second model of data access supported by ADO.NET: the disconnected model. When you use the objects discussed in this section, you do not need to keep a connection to the database open.
This section discusses four new ADO.NET objects:
• DataAdapter—
Enables you to transfer data from the physical database to the in-memory database ...
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