The following are the common namespaces in CSharp.
Contains the definition of fundamental types, conversion between types, mathematics, program invocation, and environment management.
Includes types for working with collections of objects. Collections can generally follow either list or dictionary type storage mechanisms.
This C# 2.0 added namespace works with strongly typed collections that depend on generics (type parameters).
Contains types used for working with data that is stored within a database.
Contains types for drawing to the display device and working with images.
Contains types for working with files and directories and provides capabilities for manipulating, loading, and saving files.
Provides classes and interfaces for querying data in collections using a C# 3.0 added API, Language-Integrated Query.
Includes types for working with strings and various text encodings, and for converting between those encodings. This namespace includes a subnamespace called System.Text.Regular- Expressions, which provides access to regular- expression-related APIs.
Handles thread manipulation and multithreaded programming.
Includes types for creating rich user interfaces and the components within them. System.Xml Contains standards-based support for XML processing<!>[pb_builder]