System.Drawing.Drawing2D Namespace

This namespace consists classes and enumerations for advanced 2-dimmensional and vector graphics functionality. It contains classes for gradient brushes, matrix and transformation and graphics path. Some of the common classes and enumerations are defined in the following tables -

Classes

Class	Description
Blend and ColorBlend	These classes define the blend for gradient brushes. The ColorBlend defines array of colors and position for multi-color gradient.
GraphicsPath	This class represents a set of connected lines and curves.
HatchBrush	A brush with hatch style, a foreground color, and a background color.
LinearGradientBrush	Provides a brush functionality with linear gradient.
Matrix	3x3 matrix represents geometric transformation.

Enumerations

Enumeration	Description
CombineMode	Different clipping types
CompositingQuality	The quality of compositing
DashStyle	The style of dashed lines drawn with a Pen.
HatchStyle	Represents different patterns available for HatchBrush
QualityMode	Specifies the quality of GDI+ objects.
SmoothingMode	Specifies the quality of GDI+ objects.

System.Drawing.Imaging Namespace

This namespace provides advanced GDI+ imaging functionality. It defines classes for metafile images. Other classes are encoder and decoder, which let you use any image format. It also defines a class PropertyItem, which let you store and retrieve information about the image files.  

GDI+ Font, Brush and Bitmap

GDI+ GraphicsPath and LinearGradientBrush

GDI+ Printing.

GDI+ and DrawArc and DrawPath

GDI+ Color and ARGB with Example