How to change background color of row in excel using aspose.cells

Hi,
   how to change background color for rows in excel using aspose.cells
i am using below code..But this is not working....
Style style1 = workbook.Styles[workbook.Styles.Add()];
                    style1.ForegroundColor = Color.LightGreen;
                    style1.BackgroundColor = Color.LightGreen;
                    style1.Pattern = BackgroundType.VerticalStripe;
                    style1.Font.Color = Color.Black;
 
Thanks In Advance,
kannan.S