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Most developers (and even more managers) commonly think that using software principles is first and foremost a waste of time and that no distinction is actually possible between well-designed code that works and software that just works. Guess what I totally agree with this statement. If you don t need design, any effort is overdesign. And overdesign is an anti-pattern. So you save a lot of time by skipping over principles. However, if your software that just works has to be fixed or extended one day, be aware that you will find yourself in a serious mess. The costs at that point will be much higher. It all depends on the expected lifespan of the application. Ideally, you learn principles and make them a native part of your skill set so that you use them all the time in a natural way. Otherwise, the costs of applying principles will always be too high to seem effective. Ad hoc tools can help a lot in making the development of good code more sustainable. IoC frameworks are just one of these tools. In the next chapter, I ll continue with the theme of application design by tackling layers (and communication related to them) in ASP.NET applications.

Notice that the c:\SessionData directory shouldn t be accessible from the outside world, for obvious security reasons, so it isn t under the Inetpub\wwwroot directory tree. Moreover, this directory will be accessed by the ASP.NET process, so it must be located on a non-NTFS partition or it must have been configured to allow access to the account that ASP.NET runs under. By default, this account is the Network Service account (on Windows Server 2003 when Internet Information Services is running in IIS 6 isolation mode) or the ASPNET account (in all other cases). Next, create a simple test page that increments a session variable:

14

The advantage of a bad memory is that one enjoys several times the same good things for the first time Friedrich Nietzsche Any software of any reasonable complexity is best designed if organized in layers Each layer represents a logical section of the system A layer is hosted on a physical tier (for example, a server machine) Multiple layers can be hosted on the same tier, and each layer can optionally be moved to a separate tier at any time and possibly with limited work Most of the time, you arrange a three-tiered architecture with some flavors of service orientation just to make each layer ready for a possible move to a different physical tier.

Private Sub Page_Load(ByVal sender As System.Object, ByVal e As EventArgs) _ Handles MyBase.Load If Session( counter ) Is Nothing Then Session( counter ) = 0 Else Session( counter ) = CInt(Session( counter )) + 1 End If Display current value of the variable. lblCounter.Text = Counter = & Session( counter ).ToString End Sub

In this procedure, you will test the deployment of the custom data processing extension in Report Designer.

There are various reasons to move a layer onto its own tier: a quest for increased scalability, the need for stricter security measure, and also increased reliability because the layers become decoupled in case of machine failure In a three-tiered scenario, you typically have a presentation layer where you first take care of processing any user input and then arranging responses, a business logic layer (BLL) that includes all the functional algorithms and calculations that make the system work and interact with other layers, and the data access layer (DAL) where you find all the logic required to read and write from a storage When it comes to layers, the principle of separation of concerns (SoC) that I introduced in 13, Principles of Software Design, is more important than ever A golden rule of any layered system states that no communication should be allowed between non-interfacing layers.