Listbox的操作，数据源变化时要及时更新listbox要先把数据源置空，在给数据源绑定数据

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 WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        public List<user> list = new List<user>();
        private void Form1_Load(object sender, EventArgs e)
        {

            for (int i = 0; i < 100; i++)
            {
                user info = new user();
                info.id = i.ToString();
                info.name = "name" + i.ToString();
                list.Add(info);

            }
            listBox1.DataSource = list;
            listBox1.DisplayMember = "id";
            listBox1.ValueMember = "name";
            listBox1.SelectedItems .Clear();
        }
        public List<user> list2 = new List<user>();
        private void button1_Click(object sender, EventArgs e)
        {

            for (int i = 0; i < listBox1.SelectedItems.Count; i++)
            {
                user info = list.Where(m => m.name == ((user)listBox1.SelectedItems[i]).name.ToString()).ToList()[0];
              //  list.Remove(info);
                if (list2.Contains(info)==false )
                {
                    list2.Add(info);
                }

            }
            listBox1.DataSource = null;
            listBox1.DataSource = list;
            listBox1.DisplayMember = "id";
            listBox1.ValueMember = "name";
            listBox2.DataSource = null;
            listBox2.DataSource = list2;
            listBox2.DisplayMember = "id";
            listBox2.ValueMember = "name";
            listBox2.SelectedItems.Clear();
            //listBox2.Refresh();

        }

        private void button2_Click(object sender, EventArgs e)
        {

            for (int i = 0; i < listBox1.Items.Count; i++)
            {
                listBox1.SetSelected(i, true);
            }
        }
    }
    public class user
    {
        public string id { get; set; }
        public string name { get; set; }
    }
}