protected void Page_Load(object sender, System.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;
                       }

protected void Button1_Click(object sender, EventArgs e)
        {
            FarPoint.Web.Spread.TwoColorScaleConditionalFormattingRule two = new FarPoint.Web.Spread.TwoColorScaleConditionalFormattingRule();
            two.MaxValue = new FarPoint.Web.Spread.ConditionalFormattingColorValue(Color.Red, 10, FarPoint.Web.Spread.ConditionalFormattingValueType.Max);
            FpSpread1.ActiveSheetView.SetConditionalFormatting(1, 1, two);
        }

Private Sub Page_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
            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
        End Sub

Protected Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
             Dim two As New FarPoint.Web.Spread.TwoColorScaleConditionalFormattingRule()
            two.MaxValue = New FarPoint.Web.Spread.ConditionalFormattingColorValue(Drawing.Color.Red, 10, FarPoint.Web.Spread.ConditionalFormattingValueType.Max)
            FpSpread1.Sheets(0).SetConditionalFormatting(1, 1, two)
        End Sub