How to have a transparent number on top of a winform?

So I have a winform that has some winforms controls on it. But in the center of it, I want to show a transparent number on top of everything. Say 60 pixels size.

I tried a label and even tried to create a custom con开发者_如何学Ctrol but the transparency didn't work.

Any ideas how to do this?

This number will change programmatically at runtime several times.