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You will also create unit tests for the validation logic.In the third tutorial in this series you will add sorting and filtering functionality to the application.For normal operation, you provide a repository object that works with the Entity Framework.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.In the Tables and Columns dialog box, set the primary key table and field to table if that person is a department administrator.In a production application, you would provide a specific error message when a database constraint prevents a deletion, or you would specify a cascading delete.

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This tutorial series builds on the Contoso University web application that is created by the Getting Started with the Entity Framework 4.0 tutorial series.For example, you can perform logging every time an entity is updated, archive data whenever an entity is deleted, or automatically check and update related data as needed when inserting a row with a foreign key value. For example, when you update a department, you might need to validate that no other departments have the same administrator because one person cannot be administrator of more than one department.In some that includes both business logic and data-access logic.NET Web Forms model and assumes you know how to work with ASP. The control gives you more flexibility in other ways as well.Because you write your own data-access code, it's easier to do more than just read, insert, update, or delete a specific entity type, which are the tasks that the control is designed to perform.In one of those tutorials, you made changes in the designer manually to synchronize the data model with the database after a database change.

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