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With the additional files in the site looked at, let's take a look at how you can display contact persons on a page.

Because much of the work has already been done by writing the code in the BO, Bll and Dal layers, displaying a list of contact persons is now super easy.

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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.

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.

Besides the forementioned SQL scripts and database, the download also contains the full source for the demo application in C#.

Before we dig into the code for the web site, let's briefly recap the application's design I showed you in the two previous articles.

In the Download for this application you also find the SQL Scripts to recreate the database on SQL Server 2000 or SQL Server 2005.

The , while the other points to a database on a commercial version of SQL Server 2000 or 2005.

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.

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