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called named parameters and are optional because the parameters don t have to be specified when you re applying an instance of the attribute . A little later on, I ll explain what causes an instance of the DllImportAttribute class to actually be constructed . Also note that it s possible to apply multiple attributes to a single target . For example, in this chapter s first program listing, the GetVersionEx method s ver parameter has both the In and Out attributes applied to it . When applying multiple attributes to a single target, be aware that the order of attributes has no significance . Also, in C#, each attribute can be enclosed in square brackets, or multiple attributes can be comma-separated within a single set of square brackets . If the attribute class s constructor takes no parameters, the parentheses are optional . Finally, as mentioned earlier, the Attribute suffix is also optional . The following lines behave identically and demonstrate all of the possible ways of applying multiple attributes:

Components are added in feature trees, hierarchical collections of classes that make up a feature. Integration is easier if each feature is relatively independent, perhaps calling the same low-level library code as the classes for other features, but having no calls to middle-level code in common with other features. (The shared, low-level library classes aren t shown in the illustration above.) Feature-oriented integration offers three main advantages. First, it eliminates scaffolding for virtually everything except low-level library classes. The skeleton might need a little scaffolding, or some parts of the skeleton might simply not be operational until particular features have been added. When each feature has been hung on the structure, however, no additional scaffolding is needed. Since each feature is self-contained, each feature contains all the support code it needs. The second main advantage is that each newly integrated feature brings about an incremental addition in functionality. This provides evidence that the project is moving steadily forward. A third advantage is that feature-oriented integration works well with objectoriented design. Objects tend to map well to features, which makes featureoriented integration a natural choice for object-oriented systems. Pure feature-oriented integration is as difficult to pursue as pure top-down or bottom-up integration. Usually some of the low-level code must be integrated before certain significant features can be.

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[Serializable][Flags] [Serializable, Flags] [FlagsAttribute, SerializableAttribute] [FlagsAttribute()][Serializable()]

You can generate the deployment script without specifying the target database, but it won t run because there are variables in the script that specify the target and are left empty. It s a simple matter to load the script into SSMS Studio, validate it, find these places, and manually enter the needed values. Now that you ve created the database, you need to add some test data. You ll learn how to do that in the next section.

A final approach that often addresses the problems associated with top-down and bottom-up integration is called T-Shaped Integration. In this approach, one specific vertical slice is selected for early development and integration. That slices should exercise the system end-to-end, and should be capable of flushing out any major problems in the system s design assumptions. Once that vertical slice has been implemented (and any associated problems have been corrected), then the overall breadth of the system can be developed such as the menu system in a desktop application. This approach is often combined with riskoriented or feature-oriented integration.

Now we know what kind of PE file we ve created . But what exactly is in the Program .exe file A managed PE file has four main parts: the PE32(+) header, the CLR header, the metadata, and the IL . The PE32(+) header is the standard information that Windows expects . The CLR header is a small block of information that is specific to modules that require the CLR (managed modules) . The header includes the major and minor version number of the CLR that the module was built for: some flags, a MethodDef token (described later) indicating the module s entry point method if this module is a CUI or GUI executable, and an optional strong-name

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Figure 29-12 In T-Shaped integration, you build and integrate a deep slice of the system to verify architectural assumptions, then you build and integrate the breadth of the system to provide a framework for developing the remaining functionality.