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.
The following figure shows the four main components of the application: .
Refer to this article about configuring SQL Server 2000 or 2005 if you need more information about using this second connection string.
The controls in the site will return to their default layout.
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.
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.
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.
Additionally, it can perform tasks like enforcing security and carrying out validation, as you saw in part two of this article series.