Public Property FirstFormula As String

Dim instance As BetweenValuesConditionalFormattingRule
Dim value As String
 
instance.FirstFormula = value
 
value = instance.FirstFormula

public string FirstFormula {get; set;}

protected void Page_Load(object sender, EventArgs e)
{
if (this.IsPostBack) return;
FpSpread1.Sheets[0].Cells[0, 0].Value = 3;
FpSpread1.Sheets[0].Cells[0, 1].Value = 2;
FpSpread1.Sheets[0].Cells[0, 2].Value = 1;
FpSpread1.Sheets[0].Cells[0, 3].Value = 1;
FpSpread1.Sheets[0].Cells[1, 0].Value = 2;
FpSpread1.Sheets[0].Cells[1, 1].Value = 6;

FarPoint.Web.Spread.BetweenValuesConditionalFormattingRule between = new FarPoint.Web.Spread.BetweenValuesConditionalFormattingRule(false, "=B1+B2", true, "=C1+D1", true);
between.BackColor = System.Drawing.Color.Bisque;
between.FirstFormula = "=B1+B2";
between.SecondFormula = "=C1+D1";
between.StopIfTrue = false;
FpSpread1.ActiveSheetView.SetConditionalFormatting(1, 1, between);
}

Private Sub Page_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load, Me.Load
If (IsPostBack) Then
 Return
End If
FpSpread1.Sheets(0).Cells(0, 0).Value = 3
FpSpread1.Sheets(0).Cells(0, 1).Value = 2
FpSpread1.Sheets(0).Cells(0, 2).Value = 1
FpSpread1.Sheets(0).Cells(0, 3).Value = 1
FpSpread1.Sheets(0).Cells(1, 0).Value = 2
FpSpread1.Sheets(0).Cells(1, 1).Value = 6

Dim between as New FarPoint.Web.Spread.BetweenValuesConditionalFormattingRule(false, "=B1+B2", true, "=C1+D1", true)
between.BackColor = System.Drawing.Color.Bisque
between.FirstFormula = "=B1+B2"
between.SecondFormula = "=C1+D1"
between.StopIfTrue = false
FpSpread1.ActiveSheetView.SetConditionalFormatting(1, 1, between)
End Sub