?using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;

namespace WinApp3_4圖片列表框
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            btnShowPic1.ImageIndex = 3;
            btnShowPic2.ImageIndex = 4;
            btnShowPic3.ImageIndex = 5;
        }

        private void button4_Click(object sender, EventArgs e)
        {
            btnShowPic1.ImageIndex = 3;
            btnShowPic2.ImageIndex = 4;
            btnShowPic3.ImageIndex = 5;
        }

        private void button5_Click(object sender, EventArgs e)
        {
            btnShowPic1.ImageIndex = 0;
            btnShowPic2.ImageIndex = 1;
            btnShowPic3.ImageIndex = 2;
        }
    }
}