how to update the sum of a table if i change the value value of a particular serial no.

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ASP.NET

dear sir,
i have 4 coloums like :(serial No. , received, send, balance)

serial No. received_item send_item balance
1 5
2 5 0 10
3 20 0 30
4 10 5 35
5 0 3 32
6 10 2 40

here received item added in balance and send items minus from balance and balance is added next received item and send items subtracted from balance and so on....

now if i want update value of received items of serial no. 3
like 25 in place of 20 then total increase by 5 at all place of balance coloumn after serial no. 3


AFTER updatation:-

serial No. received_item send_item balance
1 5
2 5 0 10
>Update here 3 25 0 35
4 10 5 40
5 0 3 37
6 10 2 45

what should i do for this..


reply plzzzz