public int StandardDeviation {get; set;}

private void Form1_Load(object sender, EventArgs e)
        {
            fpSpread1.Sheets[0].Cells[0, 0].Value = 3;
            fpSpread1.Sheets[0].Cells[1, 0].Value = 2;
            fpSpread1.Sheets[0].Cells[1, 1].Value = 10;
            fpSpread1.Sheets[0].Cells[0, 2].Value = 1;            
        }

        private void button1_Click(object sender, EventArgs e)
        {
            //Average CF
            FarPoint.Win.Spread.AverageConditionalFormattingRule average = new FarPoint.Win.Spread.AverageConditionalFormattingRule(true, true);
            average.IsAbove = true;
            average.IsIncludeEquals = true;
            average.StandardDeviation = 2;
            average.FontStyle = new FarPoint.Win.Spread.SpreadFontStyle(RegularBoldItalicFontStyle.Bold);
            fpSpread1.ActiveSheet.SetConditionalFormatting(1, 1, average);
        }