The Framework Class Library
Every implementation of the .NET Framework ships with a set of built-in classes: the Framework Class Library (FCL). The classes of the FCL vary widely in scope. Some provide useful APIs for performing common tasks, such as formatting text, maintaining collections, and retrieving environment variables. Others provide support for more exotic operations, such as managing a GUI, accessing a database management system (DBMS), serializing objects, evaluating regular expressions, and programming security.
Of course, not all classes of the FCL are supported in every implementation of the .NET Framework. For example, a good deal of functionality is available through the Windows Forms-based classes of the FCL that do not exist ...
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