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All they can do, is hold and expose data through their public properties.

Additionally, each BO object has a List counterpart, like and are used to hold collections of the business objects.

- I have written a new series on N-Layer design targeting ASP. How do these business objects interact with other parts of the system?

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- 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.

At the top of the diagram, you see the Web Site, the presentation layer of this application.

It's the web site and the pages and code it contains that is the main subject of this article, as you have already seen the other three parts in the previous two articles.

The following figure shows the four main components of the application: .