Implementing Subtotal functionality

Hi,
I have a web dynpro application in which i need to implement the subtotal functionality for a table.I have a table which has 5 columns, where in the first 2 columns have datatype string.So i need to find the sub total of the third column wrt first column and second column.In the same way, i need to find the subtotal of any column with integer datatype wrt any column with string datatype.
Please suggest me how to proceed.
Regards,
Padmalatha.K
Points will be rewarded.

Hi,
Create a calculatted attribute to do the calculation
public int getSub_Col(IPrivateTestCompView.IContextElement element)
    //@@begin getSub_Col
       int x = element.getAttributeValue("<Your first attribute");
       int y = Integer.parseInt(element.getAttributeValue("<Your second string attribute"))
      return x+y;
    //@@end
Pl handle the exceptions
Regards
Ayyapparaj

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