$orderby=Created desc &$filter=CreatedDate lt 2018-06-21 &$top10

$top10 &$orderby=Created desc &$filter=CreatedDate lt 2018-06-21

var parameters = new SearchParameters()
            {
                QueryType = QueryType.Full,
                OrderBy = new[] { orderBy },
                Filter = filterString,
                Top = count
            };