C # in a Nutshell, Second Edition

The FCL includes support for creating classic GUI applications. This support is known as Windows Forms, and consists of a forms package, a predefined set of GUI components , and a component model suited to RAD designer tools. These classes provide varying degrees of abstraction from low-level message-loop handler classes to high-level layout managers and visual inheritance.

For more information, see the following namespaces:

System.Windows.Forms System.Windows.Forms.Design