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;
FarPoint.Web.Spread.Model.CellRange celRange1 = new FarPoint.Web.Spread.Model.CellRange(0, 0, 3, 3);
FarPoint.Web.Spread.ThreeColorScaleConditionalFormattingRule rule = new FarPoint.Web.Spread.ThreeColorScaleConditionalFormattingRule(Color.Aqua, Color.Bisque, Color.BlueViolet);
FpSpread1.Sheets[0].SetConditionalFormatting(new FarPoint.Web.Spread.Model.CellRange[] { celRange1 }, rule);
TextBox1.Text = FpSpread1.Sheets[0].GetConditionalFormatting(0,0).ToString();