The Framework Class Library (FCL) is a standard library and one of two core components of Microsoft .NET Framework. The FCL is a collection of reusable classes, interfaces and value types. The Base Class Library is a part of FCL and provides the most fundamental functionality, which includes classes in namespaces System, System.CodeDom, System.Collections, System.Diagnostics, System.Globalization, System.IO, System.Resources and System.Text.^[1]

References

External links

• .NET Framework Developer Center. Microsoft Developer Network (MSDN).
• .NET Framework 3.5 namespaces