23.1. Understanding the Role of Entity Framework
The connected and disconnected layers of ADO.NET provide you with a fabric that lets you select, insert, update, and delete data with connections, commands, data readers, data adapters, and DataSet objects. While this is all well and good, these aspects of ADO.NET force you to treat the fetched data in a manner that is tightly coupled to the physical database schema. Recall for example, that when you use the connected layer, you typically iterate over each record by specifying column names to a data reader. On the other hand, if you opt to use the disconnected layer, you find yourself traversing the rows and columns collections of a DataTable object within a DataSet container.
If you use the disconnected ...
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