学步园

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

namespace WindowsFormsApplication3
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            Random r = new Random();

            listBox1.Items.Add(r.Next(100));
            listBox1.Items.Add(r.Next(100));
            listBox1.Items.Add(r.Next(100));
            listBox1.Items.Add(r.Next(100));
            listBox1.Items.Add(r.Next(100));
            listBox1.Items.Add(r.Next(100));
            listBox1.Items.Add(r.Next(100));
            listBox1.Items.Add(r.Next(100));
            listBox1.SelectedIndex = 0;
        }

        private void button1_Click(object sender, EventArgs e)
        {
            Close();

        }

        private void listBox1_SelectedIndexChanged(object sender, EventArgs e)
        {
            label1.Text = listBox1.Text;
        }
    }
}