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Part two showed you how to code the classes that were designed in part one.You saw how to implement the data access methods and database code and how the various classes were able to work together.Therefore, this article (part three) deals with using the business objects in a web application. NET controls like the Grid View in conjunction with the business objects.You'll see how you can build pages that allow you to list, create, edit and delete your contact persons and their contact data, like e-mail addresses and phone numbers.The following figure shows the four main components of the application: .
The , while the other points to a database on a commercial version of SQL Server 2000 or 2005.Additionally, it can perform tasks like enforcing security and carrying out validation, as you saw in part two of this article series.The data access layer contains the code that directly interacts with the data source, a SQL Server database in the case of the Contact Person Manager application but this could be any other kind of data source, like text or XML files, Access, Oracle, DB2 databases and any other data source you can come up with. - I have written a new series on N-Layer design as a major follow up to this one. Part one dealt with the design of the application: what business objects do you need to fulfill the requirements of the application. The target audience for this series are developers that are ready to make the switch from using controls with custom business objects. NET 2 and C# is necessary while some knowledge about object oriented design certainly helps.
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At the top of the diagram, you see the Web Site, the presentation layer of this application.