通过单击win form app中的按钮更改pictureBox图像

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?I'm creating a little game with windows form ap