I have the same problem but I am using DataGridView and I want to display Total Amount by summing the data from one column(from DataGridView).
In DataGriView there will be 3 columns, viz, Quantity, Rate and Amount.
Amount will be Quantity * Rate.
At the end I want to display Total Amount, i.e add all the rows in Amount column and display i footer.
If you know anything regarding this plz let me know.