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Besides the forementioned SQL scripts and database, the download also contains the full source for the demo application in C#.
The following figure shows the four main components of the application: .
They don't have any behavior, and can therefore be considered as "dumb" objects.
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.
In part two of the article series I showed you how the site was set up: the important layers each have a separate folder under the special , the site has a few other folders and files worth looking at.
This is the SQL Server 2005 Express database used for the application.In the middle of the diagram, you see the Business Logic Layer; the bridge between the web site and the data access layer.The Bll gets instructions from the presentation layer (the web site in this example), to carry out tasks, like retrieving items from the data layer, or sending changed objects back into this layer.However, the downloads for this series also come with the T-SQL scripts to recreate the database in SQL Server 2000 or SQL Server 2005.You'll find the download link at the end of this article. This is part three of the article series "Building Layered Web Applications" that shows you how to build N-Layer applications with Microsoft ASP. These articles teach you how to design, build and use custom business objects in your web application. For more information about the translation, check out this blog post.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 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.