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;
var style2 = new GrapeCity.Windows.SpreadSheet.Data.StyleInfo();
style2.Background = new SolidColorBrush(Colors.Yellow);
GrapeCity.Windows.SpreadSheet.Data.CellValueRule rule = new GrapeCity.Windows.SpreadSheet.Data.CellValueRule();
rule.Operator = GrapeCity.Windows.SpreadSheet.Data.ComparisonOperator.Between;
rule.Style = style2;
rule.Ranges = new GrapeCity.Windows.SpreadSheet.Data.CellRange[] {new GrapeCity.Windows.SpreadSheet.Data.CellRange(0, 0, 5, 1)};
rule.Value1 = 1;
rule.Value2 = 8;
GcSpreadSheet1.Sheets[0].ConditionalFormats.AddRule(rule);