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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.The entire series (including this current article) can be found here: The article uses a SQL Server 2005 Express database which is easy to use in development scenarios.Therefore, this article (part three) deals with using the business objects in a web application. NET controls like the Grid View in conjunction with the business objects.You'll see how you can build pages that allow you to list, create, edit and delete your contact persons and their contact data, like e-mail addresses and phone numbers.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.
Also, any deletions to the database records also must be played on the physical image files.The biggest drawback of storing binary data as a physical file is that your database easily can lose track of the binary data.Say, for example, you have a column that stores URLs of product images.Storing BLOBs directly inside SQL server provides the following advantages: In summary, depending on the application being developed, you should decide whether storing BLOB data in SQL Server is the way to go. To read BLOB data, you need to use the Sql Data Reader class of ADO. The use of Sql Data Reader class to read BLOB data can be best understood with an example.That said, generally CMS systems, photo albums, slide show applications, document management systems, and so forth are good candidates for storing BLOBs inside SQL Server. You will develop a simple application that manages photos stored in a SQL Server database.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.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.Next, add App_Code folder to the web site and add a new class in it. They represent the respective columns of the Photos table.Notice that you have used the auto-implemented property syntax of C# to define the properties.