c# data matrix generator PAGE OBJECT INTERNALS in Visual C#

Drawing DataMatrix in Visual C# PAGE OBJECT INTERNALS

CHAPTER 3 PAGE OBJECT INTERNALS
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The runtime keeps the shadow assemblies in a directory where you can examine them. For the markup we ve listed above, let s put it in a project named Web03 and a file named WebForm1.aspx that uses a code-behind class named WebForm1. When we compile the project and request the page, we can navigate out to the following directory. C:\WINDOWS\Microsoft.NET\Framework\v2.0.50215\Temporary ASP.NET Files\web03\EightRandomDigits\AnotherEightRandomDigits In there you ll find any number of randomly named files with variously odd extensions. One of them is your generated shadow DLL from WebForm1.aspx. You can open this DLL using ILDASM. A snippet of what it will look like is displayed in Figure 3-5.
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Figure 3-5. An inside look at a shadow DLL generated by the ASP .NET Framework A quick glance through the structure of this assembly reveals how the markup is transformed into a code file. In the ASP namespace lives the class that s generated when the Framework transforms your markup into a class. Notice that it extends the class named WebForm1, which you partially defined in your code-behind, and partially provided by code generation of the Framework. That class exists in the WebDemo namespace (a namespace of our choosing from the code-behind) and it extends System.Web.UI.Page. Refer to Figure 3-2 for a
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CHAPTER 3 PAGE OBJECT INTERNALS
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picture of this inheritance chain. What you re looking at in ILDASM (Figure 3-5) is the manifestation of that object graph within the Framework at runtime (where the proverbial rubber meets the road).
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Note There s actually a set of services in the Framework Class Library specifically designed to write code
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that generates code. Microsoft is doing this all over the place in the .NET Framework. Obviously it s doing it for ASP.NET; it s generating code for Web Service proxies and for COM Interop assemblies, just to name a few. This functionality lives in the System.CodeDom namespace. Check it out if you find yourself in a situation where you need to dynamically generate code!
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DECLARATIVE VS. IMPERATIVE CODING
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The markup in an ASP.NET page is an example of what s called declarative coding. It s a different coding model from the one most developers have become used to over the years, which is called imperative coding. Declarative coding is a technology that Microsoft is totally gung-ho about. In the 2.0 version of ASP.NET, the declarative model has been dramatically extended, so that it s now possible to create applications with very rich features, without writing a single line of code. It can all be done in the markup. One of the design goals of ASP.NET 2.0 was to dramatically reduce the amount of code you need to write for common tasks. Microsoft has accomplished this using declarative coding in the markup. By also adding high-powered graphical tools that generate this markup into the IDE, it s added some real productivity enhancement. Markup is very easy to generate programmatically, whereas source code is not. As we look forward to the next generation of the Windows operating system (named Windows Vista), Microsoft plans on creating a new model for Windows development as well, called XAML, or XML Application Markup Language. This subsystem, named Windows Presentation Foundation, will be available for Windows 2003 and Window XP, and is a declarative model for Windows-based application development. The real power in XAML lies in the fact that code is relatively static. It s like taking all of the declarations and initializations of variables out of your imperative code and moving them into a document of their own. In XAML, there will be a code-behind model as well, so the more complex, dynamic code will still be written there. Microsoft plans to couple a page-based development model with the richness in functionality of the Windows development model. Go to http://msdn.microsoft.com/Longhorn to see some concept videos of the type of application that will be produced with this new paradigm. If there are any trends in computer science to be paying attention to today, it s this declarative model of programming coupled with Aspect Oriented Programming, or AOP. You first saw AOP on the Windows platform in Microsoft Transaction Server. In this application-hosting environment you could set properties on objects specifying, for example, their transactional requirements and behavior. This would affect the run-time characteristics of the type without requiring any modification to the imperative source code. .NET attributes extend this model by promoting attributes to first-class citizens within the Common Language Runtime (CLR) and .NET languages themselves. Anytime you add the [Serialization] or [WebMethod] attributes to a class definition, you re using AOP. And again, you re affecting the runtime behavior of your type without touching the imperative code. Declarative coding and AOP are worth knowing about. Realize what they are and pay attention to the tools (.NET 2.0, Windows Communication Foundation, Windows Presentation Foundation, Windows Vista) coming out over the next few years, because these models are really going to come to the fore.
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