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The Framework Class Library
Visual C# and Visual Basic .NET provide the language syntax for describing the program flow, but to get anything done besides adding numbers, the application needs to use the Framework Class Library (FCL)[2]. On the desktop version of .NET, the FCL provides an outstanding amount of functionality, easily seducing the most skeptical of programmers with support for the most complex of tasks. The class library that comes with the Compact Framework is significantly less functional but still quite powerful.The class library in the Compact Framework supports most of the major functional groups supported by the desktop, albeit with fewer classes and methods. The Compact Framework supports threading, file operations, the 2D drawing functions, socket programming, Web service clients, and many of the other parts of the standard FCL.What isn't supported is the GDI+ drawing method, remoting, generic serialization, and classes designed for server operation. The criteria for deciding what went into the Compact Framework FCL are based on which classes were needed for basic client Windows Forms applications that access data both on the local device and through the Internet. The size of the resulting runtime was also a chief consideration because the larger the runtime, the greater the need for OEMs to use larger, more expensive Flash chips in their devices.[2] Even adding numbers could be interpreted as needing the FCL since the base types such as Int32 are defined in the class library. The high-level language simply uses aliases to these base value types that conform to the syntax of the language.
