The class library in .NET Framework consists of a collection of interfaces, classes, and value types on which the applications are built.

These collections are organized in different containers known as namespaces. They are a set of standard class libraries that can be used for different purposes in an application. Here are some of the namespaces:

• Microsoft.Sharp: This contains a type that supports compilation and code generation for C# source code, and the type that supports conversion between Dynamic Language Runtime and C#.
• Microsoft.Jscript: This contains classes that support compilation and code generation using JavaScript.
• Microsoft.VisualBasic: This contains classes that support compilation and code generation for Visual Basic.
• Microsoft.VisualC: This contains classes that support compilation and code generation for Visual C++.