datagridview sum

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C#

Hello everyone,

I'm trying to sum a row depending on a cell in front of the cell I want to sum and display the result in a label.

For example I would like to sum 5 and 20 because it's 8 in front of them and display the sum in one label, and sum 10 and 20 because it's 18 in front of them and display that sum in different label.
This should work on Button click event. I'm populating the datagrid from text boxes.

8	5
18	10
18	15
8	20

Thank you!