private void checkedListBox2_MouseDown(object sender, MouseEventArgs e)
        {
            CheckedListBox check2 = sender as CheckedListBox;

            index = check2.IndexFromPoint(e.X, e.Y);
            if (index >= 0 & e.Button == MouseButtons.Left)
            {
                check2.DoDragDrop(check2.Items[index].ToString(), DragDropEffects.Move);
            }
        }