public virtual void WritePNG(
	Stream os,
	int width,
	int height
)

Public Overridable Sub WritePNG ( 
	os As Stream,
	width As Integer,
	height As Integer
)

public:
virtual void WritePNG(
	Stream^ os, 
	int width, 
	int height
)

abstract WritePNG : 
        os : Stream * 
        width : int * 
        height : int -> unit 
override WritePNG : 
        os : Stream * 
        width : int * 
        height : int -> unit