The .NET Framework Class Library.

The .NET Framework class library works with any .NET language, such as VB.NET, VC++.NET, and VC#. This class library is built on the object-oriented nature of the runtime. The library provides classes that can be used in the code to accomplish a range of common programming tasks, such as string management, data collection, database connectivity, and file access. One of the most important features of the .NET Framework class library is that it can be used in a consistent manner across multiple languages. The .NET Framework class library comprises namespaces, which are contained within assemblies.