private bool WhereNull(DataTableResult row , DataTableSelectorData wheres){ return string.IsNullOrEmpty(row[wheres.Field]); }
private bool WhereNotNull(DataTableResult row , DataTableSelectorData wheres){ return !WhereNull(row, wheres); }
private bool WhereNested(DataTableResult row , DataTableSelectorData wheres){ return Filter(row , wheres.Selector.Wheres); }