Subtract values of ASP.Net Repeater columns using C# and VB.Net

Hi

I have 3 fields in a Repeater Id, Received, Issued.

In another column i want to display Value as Received-Issued.

In the end of repeater i want to display Total like below

Id              Received               Issued             Balance

1                10                           4                          6

2                5                             2                          3

Total           15                           6                          9

Thanks