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Most modern programming languages include some form of runtime that provides common services and access to the underlying operating systems and hardware. Examples of this range from a simple functionallibrary, such as the ANSI C Runtime used by C and C++, to the rich object-oriented class libraries provided by the Java Runtime Environment.
Similar to the way that Java programs depend on the Java class libraries and virtual machine, C# programs depend on the services in the .NET Framework such as the framework class library (FCL) and the Common Language Runtime (CLR).
For a high-level overview of the FCL, see Chapter 4.
This chapter addresses the most common tasks you need to perform when building C# programs. These topics generally fall into one of two categories: leveraging functionality included in the FCL and interacting with elements of the CLR.
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