Public Property NegativeFillColor As Color

Dim instance As DatabarConditionalFormattingRule
Dim value As Color
 
instance.NegativeFillColor = value
 
value = instance.NegativeFillColor

public Color NegativeFillColor {get; set;}

protected void Page_Load(object sender, EventArgs e)
        {
            if (IsPostBack) return;
            FpSpread1.Sheets[0].RowCount = 4;
            FpSpread1.Sheets[0].Cells[0, 0].Value = 2;
            FpSpread1.Sheets[0].Cells[1, 0].Value = -1;
            FpSpread1.Sheets[0].Cells[3, 0].Value = 3;
            FarPoint.Web.Spread.DatabarConditionalFormattingRule dataBarRule = new FarPoint.Web.Spread.DatabarConditionalFormattingRule();
            dataBarRule.AxisPosition = FarPoint.Web.Spread.DataBarAxisPosition.Automatic;
            dataBarRule.BorderColor = System.Drawing.Color.Blue;
            dataBarRule.NegativeFillColor = System.Drawing.Color.Red;
            dataBarRule.Gradient = true;
            dataBarRule.Maximum = new FarPoint.Web.Spread.ConditionalFormattingValue(FarPoint.Web.Spread.ConditionalFormattingValueType.AutoMax);
            dataBarRule.Minimum = new FarPoint.Web.Spread.ConditionalFormattingValue(FarPoint.Web.Spread.ConditionalFormattingValueType.AutoMin);
            dataBarRule.UseNegativeFillColor = true;
            dataBarRule.UseNegativeBorderColor = false;

            FarPoint.Web.Spread.ConditionalFormatting cf = new FarPoint.Web.Spread.ConditionalFormatting(new FarPoint.Web.Spread.Model.CellRange(0, 0, 4, 1));
            cf.Add(dataBarRule);
            FpSpread1.ActiveSheetView.ConditionalFormatting.Add(cf);           
        }

Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load      
        If (IsPostBack) Then Return
        FpSpread1.Sheets(0).RowCount = 4
        FpSpread1.Sheets(0).Cells(0, 0).Value = 2
        FpSpread1.Sheets(0).Cells(1, 0).Value = -1
        FpSpread1.Sheets(0).Cells(3, 0).Value = 3
        Dim dataBarRule As New FarPoint.Web.Spread.DatabarConditionalFormattingRule()
        dataBarRule.AxisPosition = FarPoint.Web.Spread.DataBarAxisPosition.Automatic
        dataBarRule.BorderColor = Drawing.Color.Blue
        dataBarRule.NegativeFillColor = Drawing.Color.Red
        dataBarRule.Gradient = True
        dataBarRule.Maximum = New FarPoint.Web.Spread.ConditionalFormattingValue(FarPoint.Web.Spread.ConditionalFormattingValueType.AutoMax)
        dataBarRule.Minimum = New FarPoint.Web.Spread.ConditionalFormattingValue(FarPoint.Web.Spread.ConditionalFormattingValueType.AutoMin)
        dataBarRule.UseNegativeFillColor = True
        dataBarRule.UseNegativeBorderColor = False

        Dim cf As New FarPoint.Web.Spread.ConditionalFormatting(New FarPoint.Web.Spread.Model.CellRange(0, 0, 4, 1))
        cf.Add(dataBarRule)
        FpSpread1.ActiveSheetView.ConditionalFormatting.Add(cf)
    End Sub