how applescript to retrieve the row selected in numbers

Hi

I'm new to applescript and I want to do a simple thing in Numbers for Mac, to get the row of the selected cell to be able to work on different cell on that row. I use the statement set this_Row to the row of selection range which look to be working, but if I try to access a column on that row it's not working. I use for example this statement

set Nom to the value of cell "C" & thisRow but not working. I try to change this_Row as string, not good. I know there's something I'm not getting right. Any suggestion

Thank you