Could you tell me which method should I use to scale the bitmap? I can't
find it.
Use the constructor overload of the Bitmap class that lets you provide an
existing bitmap (your original) and the size you want the new Bitmap to
be.
In addition to what Jeff wrote, if you want higher-quality scaling, you
need to explicitly draw the original into a new bitmap after setting the
interpolation mode to a higher-quality setting. There are a number of
threads in this newsgroup already on the topic...just use Google Groups to
find them.
(And Jeff, nice job remembering about the constructor this time!

)