GcSpreadSheet1.Sheets[0].Cells[0, 0].Value = 1;
GcSpreadSheet1.Sheets[0].Cells[1, 0].Value = 1;
GcSpreadSheet1.Sheets[0].Cells[2, 0].Value = 6;
GcSpreadSheet1.Sheets[0].Cells[3, 0].Value = -3;
GrapeCity.Windows.SpreadSheet.Data.StyleInfo style2 = new GrapeCity.Windows.SpreadSheet.Data.StyleInfo();
style2.Background = new SolidColorBrush(Colors.Yellow);
GrapeCity.Windows.SpreadSheet.Data.UniqueRule rule = new GrapeCity.Windows.SpreadSheet.Data.UniqueRule();
rule.Style = style2;
rule.Ranges = new GrapeCity.Windows.SpreadSheet.Data.CellRange[] { new GrapeCity.Windows.SpreadSheet.Data.CellRange(0, 0, 5, 1) };
GcSpreadSheet1.Sheets[0].ConditionalFormats.AddRule(rule);