gridview cell color, c#

The existing code below, applies conditional format on a gridview (works fine). It applies shades to the entire row when it meets the criteria. This gridview has 3 columns in a row.

Question: How can I modify this code so that it will apply conditional format only to the last cell in a row?

Thank you.

        if (e.Row.RowType == DataControlRowType.DataRow)
        {
            e.Row.CssClass = "highlightBracketground";
            var val = e.Row.Cells[2].Text;
            var snglVal = Single.Parse(val);
            e.Row.CssClass = snglVal > 0.0 ? "highlightBracketground" : "bracketground";
        }

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