.NET Class Libraries

The .NET Framework includes a set of standard class libraries. The class library is organized in a hierarchy of namespaces. Most of the built in APIs are part of either System.* or Microsoft.* namespaces. These class libraries implement a large number of common functions, such as file reading and writing, graphic rendering, database interaction, and XML document manipulation, among others. The .NET class libraries are available to all CLI compliant languages.

The .NET Framework class library is divided into two parts: the Base Class Library and the Framework Class Library


The Base Class Library (BCL) includes a small subset of the entire class library and is the core set of classes that serve as the basic API of the Common Language Runtime.


The Framework Class Library (FCL) is a superset of the BCL classes and refers to the entire class library that ships with .NET Framework. It includes an expanded set of libraries, including Windows Forms, ADO.NET, ASP.NET, Language Integrated Query, Windows Presentation Foundation, Windows Communication Foundation among others.


Important Namespaces :

System, System.IO, System.Globalization, System.Diagnostics, System.Collections, System.Drawing,

System.Net, System.Web,

System.Data, System.Xml, System.Data.SqlClient, System.Data.OracleClient

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