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The distribution of types across DLLs in the class library is driven by a combination of efficiency requirements and history. The System.Core library is a good example of the latter. There is no System.Core namespace this library defines types in numerous namespaces including System, System.IO, and System.Threading. But you ll also find types in these same three namespaces in the System library and also a library called mscorlib. (All .NET programs have a reference to mscorlib, and since it s mandatory, Visual Studio doesn t show it in the Solution Explorer. It s where critical types such as System.String and System.Int32 are defined.) One of the reasons System.Core exists as a separate DLL is that it first appeared in version 3.5 of .NET. With versions 3.0 and 3.5 of .NET, Microsoft chose to put completely new functionality into new DLLs rather than altering the DLLs that were provided in version 2.0. This packaging decision choosing which types go in which DLLs was independent from the conceptual decision of which types belong in which namespaces. History doesn t explain the whole story, though. Even the very first version of .NET split its namespaces across multiple libraries. One common reason for this was to avoid loading code that is never used. You wouldn t want a desktop application to waste time and memory by loading the libraries for building web applications. In some cases,

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namespaces are actually a pretty good guide to partitioning chances are good that if you use one type from one of the System.Web namespaces, you re going to be using lots of them. But there are a few cases in which namespaces are not the best way to determine packaging. For example, the System.Printing namespace is split across two libraries: the System.Printing library contains general print-related classes, but the ReachFrame work library adds extra types to the namespace that you may need if you re working with a particular kind of printable document called an XPS file. If you re not using that feature, you don t need a reference to that specialized DLL. This raises a question: how do you know where to find things It s frustrating when adding a reference to the System.Printing library fails to give you access to the types in the System.Printing namespace that you were looking for. Fortunately, the help pages for each type tell you both the namespace and the library file (assembly) containing the type.

390 environments 79 80 error messages 52, 217, 221 Evans, Eric 120 event.preventDefault() 176 177 exception handling 375 ExceptionContext 377 exec 253 254 Execute() 128 exploit 155, 164 Export Template 362 expression-based helpers 283, 293 extensibility 4, 127, 129, 131, 204 extensibility points 126 129, 135 extension methods 308 310 external input 227 external libraries 324

The upshot is that the C# compiler cannot work out which libraries you want from your using directives, because in general it s not possible to deduce which libraries are required from the namespaces alone. So a project needs to list which libraries it uses, and then individual source files in that project can declare which namespaces they are using. Visual Studio provides you with a set of references that it hopes will be useful, and for this very simple example, we re not actually using most of them.

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Visual Studio notices when your code doesn t use all of the libraries your project references, and automatically omits references to any unused libraries. This makes your binary slightly smaller than it would be if unnecessary references were left in.