Convert SQl Group by in LINQ

select FsEfId, Inc = Sum(FsIncA), Gr = sum(FsGrA),
            IncCnt = sum (case when FsIncA > 0 then 1 else 0 end)
        from FormSub where FsShId = 519 and FsPrvExmS = 'Y'
        group by FsEfId

var data = from Frm in FormSub
           where Frm.FsShid == 519 && Frm.FsPrvExms == "Y"
           group Frm by Frm.fsEfld into g
           select new { ID = g.FsEfId, Inc = g.Sum(p=> p.FsIncA),
                        Gr = g.Sum(p=> p.FsGra),
                        IncCnt = g.Count(p=> p.FsIncA >= 1) };