Change sharepoint 2010 SPGridview cell color on condition?

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SharePoint2010

I have a sharepoint 2010 SPGridview and i want to change its cell color on one condition.My condition is

string strRemoveDollar = e.Row.Cells[12].Text.ToString();

decimal theValue = Convert.ToDecimal(strRemoveDollar);

if (theValue < 17) {

e.Row.Cells[12].BackColor = Color.Red; }

else if (theValue < 10) {

e.Row.Cells[12].BackColor = Color.Green; }



How i accomplish this, where to put code so my cell color gets change on condition provided.