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Nonfunctional requirements will definitely influence the design of any architecture. Some of these requirements don t affect the software architecture; others do so indirectly; while some have a direct influence. Over the course of the book, as we examine different servers, services, and packages available within and provided for the .NET Framework, we ll revisit these requirements in-as-much as how the features a solution provides are relevant. Some are far more important than others. Performance is always a critical consideration when you design a system. If it does not perform, it will not be adopted. We ll address this throughout the text in discussions of extensibility, how to know what services to use when, and applied best practices in different areas. Security is another critically important feature of any system. Not only because it spans all of the tiers of a distributed application, but also because it s the mechanism for protecting critical enterprise data. The reputation or even the continued existence of an enterprise can depend on it. We dedicate 5 to a discussion of security and how it works in the .NET Framework, and subsequent topics address it specifically as well. You have many different considerations for keeping an application secure as you move across the tiers.

While it s really nice that EJB provides aspectized handling of many of the container services, the specification cannot possibly identify all cross-cutting concerns facing your project. For this reason, EJB makes it possible to define custom interceptors upon business methods and lifecycle callbacks. This makes it easy to contain some common code in a centralized location and have it applied to the invocation chain without impacting your core logic. Say we want to measure the execution time of all invocations to a particular method. We d write an interceptor:

and one page sequence. Our page sequence will contain a single page showing the same information as our HTML page did. Listing 5.11 contains the complete formatting tree XSL stylesheet to produce the U.S. English version of the watch list page in PDF format.

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A new Library.dbml item appears in your project, which opens the O/R Designer, shown in Figure 17-2. If you examine its properties, you ll see that its name is LibraryDataContext.

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First you remove the references to the bids by iterating the collection. You delete each Bid instance in the database. Finally, the Item is deleted. Iterating and removing the references in the collection seems unnecessary; after all, you ll delete the Item at the end anyway. If you can guarantee that no other object (or

Notice that the code doesn t declare class SquareWidget. Instead, you use the class defined in SuperLib. When you compile the MyWidgets program, however, the compiler must be aware that your code uses assembly SuperLib so it can get the information about class SquareWidget. To do this, you need to give the compiler a reference to the assembly, by giving its name and location. In Visual Studio, you can add references to a project in the following way: Select the Solution Explorer and find the References folder underneath the project name. The References folder contains a list of the assemblies used by the project. Right-click the References folder and select Add Reference. There are five tab pages from which to choose, allowing you to find the class library in different ways. For our program, select the Browse tab, browse to the DLL file containing the SquareWidget class definition, and select it. Click the OK button, and the reference will be added to the project.

namespace Example_14_8_ _ _ _Stacks { public class Tester { static void Main( ) { Stack<Int32> intStack = new Stack<Int32>( ); // populate the Stack for (int i = 0; i < 8; i++) { intStack.Push(i * 5); } // Display the Stack. Console.Write("intStack values:\t"); PrintValues(intStack); // Remove an element from the Stack. Console.WriteLine("\n(Pop)\t{0}", intStack.Pop( )); // Display the Stack. Console.Write("intStack values:\t"); PrintValues(intStack); // Remove another element from the Stack. Console.WriteLine("\n(Pop)\t{0}", intStack.Pop( )); // Display the Stack. Console.Write("intStack values:\t"); PrintValues(intStack); // View the first element in the // Stack but do not remove. Console.WriteLine("\n(Peek) \t{0}", intStack.Peek( ));

Implementing Data Annotations Extending the ModelMetadataProvider Enabling ASP .NET Ajax client-side validation

There s undoubtedly a certain resistance to source code commenting among programmers. It was ever thus! Comments acquired a bad name during the 1970s and 1980s, when the prevailing mood was for vast quantities of documentation about every variable and parameter. Pure overkill. I d suggest the ideal use for comments is in explaining the reasoning behind an algorithm. Give reasons for your answer, as countless high school examination papers would demand. To the oft-heard complaint my code is self-documenting, I d counter, only to the compiler! Justifying your ideas in a line or two before each code paragraph is a useful discipline for double-checking your own thinking, with a bonus that it helps fellow coders spot when your code doesn t live up to the promise of your comments.

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