ต้องการแปลงจาก sql(SQL Server) to Linq

select OriginalDocumentNumber ,FilterRound ,  p2_Reason , p2_FinalGrade , rowno , s_index , t_index
			from (
					select * ,

					rowno=row_number() over (partition by OriginalDocumentNumber,FilterRound order by p2_FinalGrade desc)  ,
					s_index = ROW_NUMBER() OVER(PARTITION BY FilterRound,OriginalDocumentNumber ORDER BY p2_FinalGrade),
					t_index = DENSE_RANK() OVER (ORDER BY p2_FinalGrade)
					from #TempDa 
				) l  
			where  
			l.p2_FinalGrade in ('d','f')  
			 and l.rowno = 1
			 and l.OriginalDocumentNumber = '590200054'
			 and l.p2_Reason = 'ไกลเกินไป/กำลังซื้อน้อย'
			 and l.OriginalDocumentNumber+l.FilterRound not in (select OriginalDocumentNumber+FilterRound from #TempDa where p2_FinalGrade in ('a','b','c') 
			)