ok, three very simple questions.

How can I check to see if a button is being held down?
I'm trying to increment a number when a button is pressed. How can I continue to increment that number if a button is pressed and held?

I'm also looking for some examples of pseudo-3d code. I understand this isn't assembly, but there has to be some examples out there. Vector examples or something.

Is it possible to change a PictureBox image?