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The formview fired event itemupdating which

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.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.If you haven't read part one or two yet, you should really read them first, as this article uses many concepts that have been explained in part one and two.

You'll find the download link at the end of this article.

Each of the other three components of the application has a reference to the objects in the Business Objects layer.

This means that the web site can consume objects like that are returned from the business layer that in turn got them from the data access layer.

- 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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