easy way: set the AutoRedraw propriety of a PictureBox to True, draw you graphics and then use the SavePicture method
hard way: include in the project the definition of the bitmap file standard headers using the APIViewer, save them and the image data (array of Byte) in a file open in Binary mode.
Let me know if you need more details
"There are two ways to write error-free programs. Only the third one works."