gcSpreadSheet1.Sheets[0].Cells[0, 0].Value = 1;
gcSpreadSheet1.Sheets[0].Cells[1, 0].Value = 10;
gcSpreadSheet1.Sheets[0].Cells[2, 0].Value = 6;
gcSpreadSheet1.Sheets[0].Cells[3, 0].Value = -3;
GrapeCity.Windows.SpreadSheet.Data.DataBarRule test = new GrapeCity.Windows.SpreadSheet.Data.DataBarRule();
test.NegativeBorderColor = Color.FromArgb(150, 10, 100, 99);
test.UseNegativeBorderColor = true;
test.Gradient = false;
test.ShowBorder = true;
test.MaximumType = GrapeCity.Windows.SpreadSheet.Data.ScaleValueType.HighestValue;
test.MinimumType = GrapeCity.Windows.SpreadSheet.Data.ScaleValueType.LowestValue;
test.UseNegativeFillColor = true;
test.NegativeFillColor = Colors.Purple;
test.Ranges = new GrapeCity.Windows.SpreadSheet.Data.CellRange[] { new GrapeCity.Windows.SpreadSheet.Data.CellRange(0, 0, 5, 1) };
gcSpreadSheet1.Sheets[0].ConditionalFormats.AddRule(test);