title: pictureBox image change by clicking a button in win form app
body: <p>I'm creating a little game with windows form app. in this game the user have 5 tries.
  so I want to show remaining tries in a picture box.
  for example:
  at the beginning the picture box image is show num5 icon.
  when the user click the button the picture box show num4 icon and so on. 
  what can I do?</p>