Abstract: In the Visual C#.NET programming environment using GDI+ graphics, such as straight line, rectangle, text and so on, all is not an instance of the class, does not have its own properties and methods, leads to very difficult to have the drawing to choose and do the next revision and application. This paper describes how to use GDI+ graphics rendering to realize the plot graph selection.

Key words: C#, GDI+, custom graphics, selection