Telerik.Web.Mvc.GroupDescriptor.GetNextSortDirection C# (CSharp) 메소드

        private static ListSortDirection GetNextSortDirection(ListSortDirection? sortDirection)
        {
            switch (sortDirection)
            {
                case ListSortDirection.Ascending:
                    return ListSortDirection.Descending;
                default:
                    return ListSortDirection.Ascending;
            }
        }