show the sum of multiple columns on the label

Hi,

My query is like this:

I have multiple rows and columns in table view. I am able to show the sum of textField1, textField2 in textField3 in one row. i.e 1 + 2 = 3. Like that showing in row2 also for textField4, textField5 & textField6.

Now, I am trying to display the sum of columns textField1 (row1) and textField4 (row2) on label (row3). Tried in many ways, but not able to resolve it. Some one pls help to resolve this issue.

Many thanks