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If you've peeked under the covers at the details of how .NET assemblies are executed, you will have picked up on the fact that instead of compiling to machine language (and regardless of the programming language used), all .NET source code is compiled into the Microsoft Intermediary Language (MSIL, or just IL, for short). The IL is then just-in-time compiled when it is required for execution. This two-stage approach has a number of significant advantages, such as enabling you to dynamically query an assembly for type and method information, using reflection. However, this is a double-edged sword because this same flexibility means that once-hidden algorithms and business logic can easily be reverse-engineered and modified, legally or otherwise. This chapter introduces tools and techniques that help to protect your ...