public ActionResult IndexData(Models.DataTables.jqDataTableInput input, int?filterId)
        {
            var data = EventSubTypeOperations.GetData();

            if (filterId.HasValue)
            {
                data = data.Where(f => f.ID == filterId.Value);
            }

            var source = EventSubTypeOperations.GetRows(data);

            System.Linq.Expressions.Expression <Func <EventSubTypesRowViewModel, bool> > prefilter = null;
            return(new Models.DataTables.DataTablesActionResult <EventSubTypesRowViewModel>(source, input, prefilter));
        }