Since the release of the .NET platform (circa 2001), the base class libraries have included a particular API named Windows Forms (represented by the
System.Windows.Forms.dll assembly). As you may know, the Windows Forms toolkit provides the types necessary to build desktop graphical user interfaces (GUIs), create custom controls, manage resources (string tables, icons, etc.), and perform other GUI-centric programming tasks. In addition, a separate API named GDI+ (bundled within the
System.Drawing.dll assembly) provides additional types that allow programmers to generate 2D graphics, interact with networked printers, and manipulate image data.
The Windows Forms (and GDI+) APIs are still alive and well with ...