Choose some photos randomly [on hold]

I want to make a program in visual studio.

I've a photo, and on this photo I have small pictureboxes like pins on a photo.

I have 30 pictureboxes, and Ι want to get 10 visible of the 30 randomly, and the rest of them (20) be invisible, like when making a test/quiz randomly generated.

Can somebody help me how to make this?