DropDownList item 동적으로 추가하기

 private void dropdownListnullValue(DropDownList ddl, string nullMessage, bool isSelect)
        {
            ListItem items = new ListItem();
            items.Text = nullMessage;
            items.Value = "nullMessage";
            items.Selected = isSelect;

            ddl.Items.Add(items);
        }

        protected void movie_DDL_DataBound(object sender, EventArgs e)
        {
            if (movie_DDL.Items.Count.Equals(0))
            {
                dropdownListnullValue(movie_DDL, "영화 목록이 없습니다.", true);
            }
        }