programatically change gridview row background color

//change bgcolor of gridview row based on data
//in this case the data I am testing is in a templatefield that is hidden
//if the data had been added in the last hour, then I apply a certain css class

protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
        {
            if (e.Row.RowType == DataControlRowType.DataRow)
            {
                DateTime entryDate = Convert.ToDateTime(((DataRowView)e.Row.DataItem)["DtEnter"]);
                DateTime nowDate = DateTime.Now;
                TimeSpan ts = nowDate.Subtract(entryDate);
                
                if (ts.TotalMinutes <= 60)
                {
                    e.Row.CssClass = "updatedRow";
                }
            }
        }