asp.net ListBox 移除操作的思路

        ArrayList arrRight = new ArrayList();
        protected void ImageButton1_Click(object sender, ImageClickEventArgs e)
        {
            foreach (ListItem li in this.ListBox2.Items)
            {
                if (li.Selected)
                {
                    arrRight.Add(li);
                }
            }
            foreach (ListItem item in arrRight)
            {
                ListBox1.Items.Add(item);
                ListBox2.Items.Remove(item);
            }
        }