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

Dim instance As SheetView
Dim row As Integer
Dim column As Integer
Dim isCombinable As Boolean
Dim rules() As IConditionalFormattingRule
 
instance.SetConditionalFormatting(row, column, isCombinable, rules)

public void SetConditionalFormatting( 
   int row,
   int column,
   bool isCombinable,
   params IConditionalFormattingRule[] rules
)

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)
        {
            FarPoint.Win.Spread.UnaryComparisonConditionalFormattingRule unary = new FarPoint.Win.Spread.UnaryComparisonConditionalFormattingRule(FarPoint.Win.Spread.UnaryComparisonOperator.EqualTo, 10, false);
            unary.Operator = FarPoint.Win.Spread.UnaryComparisonOperator.EqualTo;
            unary.Value = 10;
            unary.BackColor = Color.Red;
            unary.FontStyle = new FarPoint.Win.Spread.SpreadFontStyle(RegularBoldItalicFontStyle.Bold);            
     
            FarPoint.Win.Spread.BetweenValuesConditionalFormattingRule between = new FarPoint.Win.Spread.BetweenValuesConditionalFormattingRule(true, 10, false, 20, false);
            between.FirstValue = 1;
            between.SecondValue = 20;
            between.IsNotBetween = true;
            between.BackColor = Color.Bisque;
                        
            //SetConditionalFormatting Overload
            fpSpread1.ActiveSheet.SetConditionalFormatting(0, 0, 3, 3, false, unary, between);
            //fpSpread1.ActiveSheet.SetConditionalFormatting(new FarPoint.Win.Spread.Model.CellRange[] { new FarPoint.Win.Spread.Model.CellRange(1, 1, 2, 3), new FarPoint.Win.Spread.Model.CellRange(1, 2, 2, 1) }, unary, between);
            //fpSpread1.ActiveSheet.SetConditionalFormatting(new FarPoint.Win.Spread.Model.CellRange[] { new FarPoint.Win.Spread.Model.CellRange(1, 1, 2, 3), new FarPoint.Win.Spread.Model.CellRange(1, 2, 2, 1) }, false, unary);
            //fpSpread1.ActiveSheet.SetConditionalFormatting(1, 1, unary);
            //fpSpread1.ActiveSheet.SetConditionalFormatting(1, 1, false, unary);
            //fpSpread1.ActiveSheet.SetConditionalFormatting(0, 0, 3, 3, unary, between);
            //fpSpread1.ActiveSheet.SetConditionalFormatting(0, 0, 3, 3, false, unary);
        }

Private Sub Form1_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

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        Dim unary As New FarPoint.Win.Spread.UnaryComparisonConditionalFormattingRule(FarPoint.Win.Spread.UnaryComparisonOperator.EqualTo, 10, False)
        unary.Operator = FarPoint.Win.Spread.UnaryComparisonOperator.EqualTo
        unary.Value = 10
        unary.BackColor = Color.Red
        unary.FontStyle = New FarPoint.Win.Spread.SpreadFontStyle(RegularBoldItalicFontStyle.Bold)

        Dim between As New FarPoint.Win.Spread.BetweenValuesConditionalFormattingRule(True, 10, False, 20, False)
        between.FirstValue = 1
        between.SecondValue = 20
        between.IsNotBetween = True
        between.BackColor = Color.Bisque

        'SetConditionalFormatting Overload
        FpSpread1.ActiveSheet.SetConditionalFormatting(0, 0, 3, 3, False, unary, between)
        'FpSpread1.ActiveSheet.SetConditionalFormatting(New FarPoint.Win.Spread.Model.CellRange() {New FarPoint.Win.Spread.Model.CellRange(1, 1, 2, 3), New FarPoint.Win.Spread.Model.CellRange(1, 2, 2, 1)}, unary, between)
        'FpSpread1.ActiveSheet.SetConditionalFormatting(New FarPoint.Win.Spread.Model.CellRange() {New FarPoint.Win.Spread.Model.CellRange(1, 1, 2, 3), New FarPoint.Win.Spread.Model.CellRange(1, 2, 2, 1)}, False, unary)
        'FpSpread1.ActiveSheet.SetConditionalFormatting(1, 1, unary)
        'FpSpread1.ActiveSheet.SetConditionalFormatting(1, 1, False, unary)
        'FpSpread1.ActiveSheet.SetConditionalFormatting(0, 0, 3, 3, unary, between)
        'FpSpread1.ActiveSheet.SetConditionalFormatting(0, 0, 3, 3, False, unary)
    End Sub