private void gList_GridReorder(object sender, GridReorderEventArgs e)
{
var rockContext = new RockContext();
ChapterService chapterService = new ChapterService(rockContext);
var courseId = PageParameter(PageParameterKey.CourseId).AsInteger();
var items = chapterService.Queryable().Where(p => p.CourseId == courseId).OrderBy(i => i.Order).ToList();
chapterService.Reorder(items, e.OldIndex, e.NewIndex);
rockContext.SaveChanges();
BindGrid();
}