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 = 3;
            fpSpread1.Sheets[0].Cells[0, 2].Value = 1;            
        }

        private void button1_Click(object sender, EventArgs e)
        {
            FarPoint.Win.Spread.FormulaConditionalFormattingRule formula = new FarPoint.Win.Spread.FormulaConditionalFormattingRule("=A1");
            formula.BackColor = Color.Orange;
            fpSpread1.ActiveSheet.SetConditionalFormatting(1,1,formula);
         }

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 = 3
        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 formula As New FarPoint.Win.Spread.FormulaConditionalFormattingRule("=A1")
        formula.BackColor = Color.Orange
        FpSpread1.ActiveSheet.SetConditionalFormatting(1, 1, formula)
    End Sub