Public Overloads Sub SetConditionalFormatting( _
   ByVal row As Integer, _
   ByVal column As Integer, _
   ByVal rowCount As Integer, _
   ByVal columnCount As Integer, _
   ByVal combinable As Boolean, _
   ByVal ParamArray rules() As IConditionalFormattingRule _
) 

Dim instance As SheetView
Dim row As Integer
Dim column As Integer
Dim rowCount As Integer
Dim columnCount As Integer
Dim combinable As Boolean
Dim rules() As IConditionalFormattingRule
 
instance.SetConditionalFormatting(row, column, rowCount, columnCount, combinable, rules)

public void SetConditionalFormatting( 
   int row,
   int column,
   int rowCount,
   int columnCount,
   bool combinable,
   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.UnaryComparisonConditionalFormattingRule unary = new FarPoint.Web.Spread.UnaryComparisonConditionalFormattingRule(FarPoint.Web.Spread.UnaryComparisonOperator.EqualTo, 10);
            unary.Operator = FarPoint.Web.Spread.UnaryComparisonOperator.EqualTo;
            unary.Value = 10;
            unary.BackColor = Color.Red;
            unary.FontStyle = new FarPoint.Web.Spread.SpreadFontStyle(FarPoint.Web.Spread.UnderlineFontStyle.None);
            unary.FontStyle.RegularBoldItalic = FarPoint.Web.Spread.RegularBoldItalicFontStyle.Bold;

            FarPoint.Web.Spread.BetweenValuesConditionalFormattingRule between = new FarPoint.Web.Spread.BetweenValuesConditionalFormattingRule(false, 1, false, 20, false);
            between.FirstValue = 1;
            between.SecondValue = 20;
            between.IsNotBetween = true;
            between.BackColor = Color.Bisque;

            //SetConditionalFormatting Overload
            FpSpread1.ActiveSheetView.SetConditionalFormatting(0, 0, 3, 3, false, unary, between);
            //FpSpread1.ActiveSheetView.SetConditionalFormatting(new FarPoint.Web.Spread.Model.CellRange[] { new FarPoint.Web.Spread.Model.CellRange(1, 1, 2, 3), new FarPoint.Web.Spread.Model.CellRange(1, 2, 2, 1) }, unary, between);
            //FpSpread1.ActiveSheetView.SetConditionalFormatting(new FarPoint.Web.Spread.Model.CellRange[] { new FarPoint.Web.Spread.Model.CellRange(1, 1, 2, 3), new FarPoint.Web.Spread.Model.CellRange(1, 2, 2, 1) }, FarPoint.Web.Spread.ConditionalFormattingCompactMode.Solid, unary);
            //FpSpread1.ActiveSheetView.SetConditionalFormatting(1, 1, unary);
            //FpSpread1.ActiveSheetView.SetConditionalFormatting(1, 1, false, unary);
            //FpSpread1.ActiveSheetView.SetConditionalFormatting(0, 0, 3, 3, unary, between);
            //FpSpread1.ActiveSheetView.SetConditionalFormatting(0, 0, 3, 3, false, unary);
        }

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

Dim unary As New FarPoint.Web.Spread.UnaryComparisonConditionalFormattingRule(FarPoint.Web.Spread.UnaryComparisonOperator.EqualTo, 10)
            unary.Operator = FarPoint.Web.Spread.UnaryComparisonOperator.EqualTo
            unary.Value = 10
            unary.BackColor = Drawing.Color.Red
            unary.FontStyle = New FarPoint.Web.Spread.SpreadFontStyle(FarPoint.Web.Spread.UnderlineFontStyle.None)
            unary.FontStyle.RegularBoldItalic = FarPoint.Web.Spread.RegularBoldItalicFontStyle.Bold

            Dim between As New FarPoint.Web.Spread.BetweenValuesConditionalFormattingRule(False, 1, False, 20, False)
            between.FirstValue = 1
            between.SecondValue = 20
            between.IsNotBetween = True
            between.BackColor = Drawing.Color.Bisque

            'SetConditionalFormatting Overload
            FpSpread1.ActiveSheetView.SetConditionalFormatting(0, 0, 3, 3, False, unary, between)
            'FpSpread1.ActiveSheetView.SetConditionalFormatting(New FarPoint.Web.Spread.Model.CellRange() {New FarPoint.Web.Spread.Model.CellRange(1, 1, 2, 3), New FarPoint.Web.Spread.Model.CellRange(1, 2, 2, 1)}, unary, between)
            'FpSpread1.ActiveSheetView.SetConditionalFormatting(New FarPoint.Web.Spread.Model.CellRange() {New FarPoint.Web.Spread.Model.CellRange(1, 1, 2, 3), New FarPoint.Web.Spread.Model.CellRange(1, 2, 2, 1)}, FarPoint.Web.Spread.ConditionalFormattingCompactMode.Solid, unary)
            'FpSpread1.ActiveSheetView.SetConditionalFormatting(1, 1, unary)
            'FpSpread1.ActiveSheetView.SetConditionalFormatting(1, 1, False, unary)
            'FpSpread1.ActiveSheetView.SetConditionalFormatting(0, 0, 3, 3, unary, between)
            'FpSpread1.ActiveSheetView.SetConditionalFormatting(0, 0, 3, 3, False, unary)