Controls are placed at the top and bottom
pictureBox1.BringToFront();//将控件放置所有控件最前端
pictureBox1.SendToBack();//将控件放置所有控件最底端
Control hide and show
pictureBox1.Visible = true;//显示
pictureBox1.Visible = false;//隐藏
Controls are placed at the top and bottom
pictureBox1.BringToFront();//将控件放置所有控件最前端
pictureBox1.SendToBack();//将控件放置所有控件最底端
Control hide and show
pictureBox1.Visible = true;//显示
pictureBox1.Visible = false;//隐藏