GcSpreadSheet1.Sheets[0].Cells[0, 0].Value = -1;
GcSpreadSheet1.Sheets[0].Cells[1, 0].Value = 49;
GcSpreadSheet1.Sheets[0].Cells[2, 0].Value = 101;
GrapeCity.Windows.SpreadSheet.Data.ThreeColorScaleRule rule = new GrapeCity.Windows.SpreadSheet.Data.ThreeColorScaleRule();
rule.MinimumColor = Colors.Yellow;
rule.MinimumType = GrapeCity.Windows.SpreadSheet.Data.ScaleValueType.Number;
rule.MinimumValue = 1;
rule.MidpointColor = Colors.Blue;
rule.MidpointType = GrapeCity.Windows.SpreadSheet.Data.ScaleValueType.Number;
rule.MidpointValue = 50;
rule.MaximumColor = Colors.Red;
rule.MaximumType = GrapeCity.Windows.SpreadSheet.Data.ScaleValueType.Number;
rule.MaximumValue = 100;
rule.Ranges = new GrapeCity.Windows.SpreadSheet.Data.CellRange[] { new GrapeCity.Windows.SpreadSheet.Data.CellRange(0, 0, 20, 1) };
GcSpreadSheet1.Sheets[0].ConditionalFormats.AddRule(rule);