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C# is a programming language. Like any language, C# has a syntax and a vocabulary. Programming languages, like C# or Java, differ from natural languages, such as English or French. Learning a new programming language is easier than learning a natural language. There are only a handful of words in a programming language vocabulary; C# has around 100 keywords. That may seem daunting, but you ll use some keywords more than others and you probably won t use some of them at all. Programming languages have very rigid syntaxes the keywords have to be used in a certain way. English is fluid and flexible because it is used for so many different reasons. Programming languages are

Now that we have discussed adding security requirements to requirements documents, and how to design in security, let s discuss some of the gotchas in implementing mechanisms that actually enforce these security requirements. One problem is that many organizations practice security through obscurity that is, what they attempt to do is keep their information systems and products secure by keeping the security mechanisms confidential. For example, a company may not publicly disclose how their products work (even to their customers). They reason that if information about how their products work was to fall into the hands of a bad guy, this bad guy might use that information to construct an attack. The military also practices security by obscurity, and will only disseminate information about how their systems work to certain people on a need-to-know basis. In both cases, these organizations are trying to keep information secure by hiding it from others. Security by obscurity, in itself, is not a bad idea it does increase the amount of effort an adversary has to go though in order to attack a system. However, while security by obscurity may be necessary in some scenarios, it is certainly not sufficient to prevent a determined attacker.

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terse and precise because they are used for one reason: to express your instructions to the computer as clearly and unambiguously as possible. Helpfully, there is a universal, authoritative specification for C#. Grammarians can vigorously debate the history and meaning of words in English, but in C# the history of all keywords is that they were defined by Microsoft and the meaning is contained in the C# language specification, which you can find at http://msdn.microsoft.com/en-us/library/ms228593.aspx. I am not suggesting that you run off and read the language specification right now; it is a dry, precise, overlytechnical document in the way that formal specifications tend to be. But if you are ever in doubt about the exact meaning and use of a C# term, the specification provides the authoritative reference.

The .NET Framework runs .NET programs. For client applications, this means that the user must install the framework before running your program for the first time (although many developers include the .NET Framework in their program installers to make life easier for the user). For servers, the .NET Framework must be installed before running .NET-based services, such as web applications. There are two parts to the .NET Framework, described in the following sections.

The Common Language Runtime (CLR) is the part that actually executes .NET programs i.e. performs the instructions that you gave using C#. The CLR (commonly referred to as the runtime) is a virtual machine, an idea you will be familiar with if you have used Java. In essence, the CLR provides the services that provide and enforce the .NET feature set, freeing the programmer from working directly with the operating system. The CLR lets the Microsoft .NET designers add features to make life easier for programmers (such as automatic memory management, described in the Understanding Automatic Memory Management section) and remove or restrict problematic features (such as unsafe code, covered in the Understanding Unmanaged/Native Code Support section). The C# compiler translates your C# code into Common Intermediate Language (CIL) instructions, which is the language of the CLR. When you run your compiled program, the CLR loads the CIL and gets to work.

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