u can get the complete row instance by
e.Rows GridViewRow gr = e.Row;
each row has collection of cells
so to get instance of each cell u can u use e.Rows.Cells[index]
where index = column u want to access
for text of a cell string
str = e.Row.Cells[0].Text;
or
e.Row.Cells[0].Text = "its me";