The
Framework Class Library (
FCL) is a
standard library and Microsoft's
.NET Framework implementation of the
Standard Libraries as defined in the
Common Language Infrastructure. The FCL is a collection of reusable classes, interfaces and value types. The
Base Class Library (BCL) is the core of the FCL and provides the most fundamental functionality, which includes classes in namespaces
System
,
SystemCodeDom
,
SystemCollections
,
SystemDiagnostics
,
SystemGlobalization
,
SystemIO
,
SystemResources
and
SystemText
.