NET Web Forms applications using the Entity Framework 4.0 and Visual Studio 2010.

The sample application is a website for a fictional Contoso University.

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You will begin by creating web pages in which the control to that class instead of to the repository class.

You will also create unit tests for the validation logic.

For testing, you provide a repository object that works with data stored in a way that you can easily manipulate, such as class variables defined as collections.

The following illustration shows the difference between a business-logic class that includes data-access logic without a repository and one that uses a repository.

The class that encapsulates data-access logic is called a .

The business logic class includes both business-logic methods and data-access methods, but the data-access methods call the repository to perform data-access tasks.

In some that includes both business logic and data-access logic.

In this tutorial you will create separate classes for business logic and for data-access logic.

A Grid View Delete Event Args object is passed to the event-handling method, which enables you to determine the index of the current row and to indicate that the delete operation should be canceled.