Public Overloads Sub SetConditionalFormatting( _
   ByVal cellRanges() As CellRange, _
   ByVal ParamArray rules() As IConditionalFormattingRule _
) 

Dim instance As SheetView
Dim cellRanges() As CellRange
Dim rules() As IConditionalFormattingRule
 
instance.SetConditionalFormatting(cellRanges, rules)

public void SetConditionalFormatting( 
   CellRange[] cellRanges,
   params IConditionalFormattingRule[] rules
)

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.Model.CellRange celRange1 = new FarPoint.Web.Spread.Model.CellRange(0, 0, 3, 3);
            FarPoint.Web.Spread.ThreeColorScaleConditionalFormattingRule rule = new FarPoint.Web.Spread.ThreeColorScaleConditionalFormattingRule(Color.Aqua, Color.Bisque, Color.BlueViolet);
            FpSpread1.Sheets[0].SetConditionalFormatting(new FarPoint.Web.Spread.Model.CellRange[] { celRange1 }, rule);
            //or
            //FarPoint.Web.Spread.Model.CellRange celRange1 = new FarPoint.Web.Spread.Model.CellRange(0, 0, 3, 3);
            //FarPoint.Web.Spread.Model.CellRange celRange2 = new FarPoint.Web.Spread.Model.CellRange(0, 4, 2, 2);
            //FarPoint.Web.Spread.ThreeColorScaleConditionalFormattingRule rule = new FarPoint.Web.Spread.ThreeColorScaleConditionalFormattingRule(Color.Aqua, Color.Bisque, Color.BlueViolet);
            //FpSpread1.Sheets[0].SetConditionalFormatting(new FarPoint.Web.Spread.Model.CellRange[] { celRange1, celRange2 }, rule);
            //or
            //FarPoint.Web.Spread.ThreeColorScaleConditionalFormattingRule three = new FarPoint.Web.Spread.ThreeColorScaleConditionalFormattingRule();
            //three.MidValue = new FarPoint.Web.Spread.ConditionalFormattingColorValue(Color.Aqua, 10, FarPoint.Web.Spread.ConditionalFormattingValueType.Number);
            //three.MinValue = new FarPoint.Web.Spread.ConditionalFormattingColorValue(Color.BlueViolet, 10, FarPoint.Web.Spread.ConditionalFormattingValueType.Number);
            //FpSpread1.Sheets[0].SetConditionalFormatting(1, 1, three);
        }

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 celRange1 As New FarPoint.Web.Spread.Model.CellRange(0, 0, 3, 3)
            Dim rule As New FarPoint.Web.Spread.ThreeColorScaleConditionalFormattingRule(Drawing.Color.Aqua, Drawing.Color.Bisque, Drawing.Color.BlueViolet)
            FpSpread1.Sheets(0).SetConditionalFormatting(New FarPoint.Web.Spread.Model.CellRange() {celRange1}, rule)
            'or
            'Dim celRange1 As New FarPoint.Web.Spread.Model.CellRange(0, 0, 3, 3)
            'Dim celRange2 As New FarPoint.Web.Spread.Model.CellRange(0, 4, 2, 2)
            'Dim rule As New FarPoint.Web.Spread.ThreeColorScaleConditionalFormattingRule(Drawing.Color.Aqua, Drawing.Color.Bisque, Drawing.Color.BlueViolet)
            'FpSpread1.Sheets(0).SetConditionalFormatting(New FarPoint.Web.Spread.Model.CellRange() {celRange1, celRange2}, rule)
            'or
            'Dim three As New FarPoint.Web.Spread.ThreeColorScaleConditionalFormattingRule()
            'three.MidValue = New FarPoint.Web.Spread.ConditionalFormattingColorValue(Drawing.Color.Aqua, 10, FarPoint.Web.Spread.ConditionalFormattingValueType.Number)
            'three.MinValue = New FarPoint.Web.Spread.ConditionalFormattingColorValue(Drawing.Color.BlueViolet, 10, FarPoint.Web.Spread.ConditionalFormattingValueType.Number)
            'FpSpread1.Sheets(0).SetConditionalFormatting(1, 1, three)
        End Sub