subtracting item value in List with comparing another List Items

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C#

C#4.0

Hi All
Please Help me i have 2 List that contains data for School Software in FEES module


one List contains FEES to Applied of the student based on months and FEES structure
second contains FEES to collect from student month wise and structure wise

problem is that if a student deposit his fees for perticular months then how can i calculate
remaining fees based on applied fees list for perticular month wise.and structure wise that


i am not getting any idea .



my code for applied fees list is

var ljoin = from HeadId in lFeestrmaster2
            join structure in lstrdetaillist
            on HeadId.strId equals structure.strId
         select new { HeadId.strHeadId, structure.strmonthId, structure.fAmount };

and

for deposit fees is

var lCollection = from item in ldetail
                   join Collectionmaster in listaccount
                   on item.BillNo equals Collectionmaster.BillNo
                   select new {Collectionmaster.FeeMonthId,  item.FeeHeadId  , item.FeeAmt} ;

i need to show this data in 2 GRID like
month Id | Remaining Fees (Amount)

and

HeadID | Amount

how can i iterate and get that student has deposite or not deposited his /her fees
with matching months and feesheads .


thanks