int index = Cchart.Series[0].Points.AddXY(row.Cells["ExD"].Value.ToString(),
        row.Cells[12].Value.ToString());
        for (int ip =0; ip < Cchart.Series[0].Points.Count; ip++)
        {
            DataPoint newPoint = Cchart.Series[0].Points[index];
            if (ip > 1)
            OH = Convert.ToDecimal(newPoint.YValues[0].ToString());
            POH = Convert.ToDecimal(newPoint.YValues[ip-1].ToString());
            if (OH-POH < 0)
            { newPoint.Color = Color.Red; }
            else { newPoint.Color = Color.Green; }
        }