recalculate grid values (Totals)

Hi good night.

I have a problem. I need to re-calculate the values ​​of the “Accumulated amount” column every time I make a change in any column of the grid (specially the colum TotalAmount). re-calculated de values and show in the grid.

The business rule for the “Accumulated total amount” column is as follows:sum current row + previous row. (in the first row the previous row is zero).

I used this code in the row_updated event but it doesn't work as I expect. (This code is in the Row_Updated Event

//In this code for each interaction 1 is added so if I have a grid with 4 rows in AccumulatedAmount //it should look like: 1,2,3,4 but it doesn't work

          int cont = 0;

            foreach (CEEstimateAddOn soLine in this.viewCEEstimateAddOn.Select())
        {
          cont+=1;
          soLine.AccumulatedAmount = cont;
        }

with the code above only the “edited/active” row show the result. 

and not in all rows as I need

Could you please help me.