I would like to have a form in which the controls on the form are fully visible but the form itself is invisible. If I change the form’s Opacity, this makes both the form and the controls on it semi-transparent, so this doesn’t work.
I can’t do this by setting the form’s TransparencyKey, since I have a PictureBox on the form. If the image in the PictureBox happens to contain pixels that match the TransparencyKey, they appear as openings in the form, which I don’t want.
TransparencyKey is the only way to get this. Pick the right color. Color.Fuchsia has a long tradition of being the color of choice, going back to the early days of Win32 development. Assault your eye with it to see its merits.