I am sorry, I was trying to convert in to lambda or linq but could n't able to do.
FYI:
I did it by
var query = (from x in mbsRateTempList
from y in mbsSavedRecordList
.Where(y => y.CouponRate == x.CouponRate && x.Price == y.Price
&& x.MbsSecurityId == y.MbsSecurityId && x.SettlementMonth.Month == y.SettlementMonth.Month)
select new { tempId = x.tempId, Id = y.Id }).ToList();
Is there any other way to do this ?