Maybe you're a little bit confused, because a Bitmap is actually an image, it inherits from the Image class.
This is the declaration of the Bitmap class (From MSDN documentation about the Bitmap)
[SerializableAttribute]
[ComVisibleAttribute(true)]
public sealed class Bitmap : Image
http://msdn.microsoft.com/en-us/library/system.drawing.bitmap.aspx[
^]
It would be prefered if you would show the actual error that you're getting from the Compiler (or IntelliSense if you're using Visual Studio).