form1.cs

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

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

        private void listBox1_SelectedIndexChanged(object sender, EventArgs e)
        {

        }

        private void button3_Click(object sender, EventArgs e)
        {
            //string youchose = this.listBox1.SelectedItem.ToString();
            //MessageBox.Show(youchose);
            string youchose = "";
            for (int i = 0; i < this.listBox1.SelectedItems.Count; i++)
            {
                youchose+="  "+ this.listBox1.SelectedItems[i].ToString();
            }
            MessageBox.Show(youchose);
        }

        private void button1_Click(object sender, EventArgs e)
        {
            for (int i = 0; i < this.listBox1.SelectedItems.Count; i++)
            {
                //添加到listbox2
                this.listBox2.Items.Add(this.listBox1.SelectedItems[i]);
            }
        }
    }
}