Sum and Grouping in Linq

How would i do the following in Linq. Here is the SQL

Select duesyearmontn, sum(duesamount) as duesrate
from duesowed
where socsecno = "999-99-9999' and duescatcd = 'D'
group by duesyearmonth
having sum(duesamount) <> 0
order by duesyearmonth desc



this is what i have so far

               var duesOwedQuery = _manager.DuesOweds
                    .Where(d => d.SocSecNo == member.SocSecNo && d.DuesCatCd.StartsWith("D"))
                    .OrderByDescending(d => d.DuesYearMonth);
 
                var duesOweds1 = duesOwedQuery.Execute<DuesOwed>();

how do i handle the group by and having clause?

Bill