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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.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.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.To display a list of users in a will be quite plain, with black text on a white background.Although the ASPX page only needs 11 lines of code, a lot of other code is executed under the hood.
You'll find the download link at the end of this article. - 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.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.The following figure shows the four main components of the application: .