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);
             }
         }