// For complete examples and data files, please go to https://github.com/aspose-cells/Aspose.Cells-for-.NET
// The path to the documents directory.
string dataDir = RunExamples.GetDataDir(System.Reflection.MethodBase.GetCurrentMethod().DeclaringType);

/*
 * Create a workbook.
 * Open a template file. 
 * In the book1.xls file, we have applied Ms Excel's 
 * Named style i.e., "Percent" to the range "A1:C8".
*/
Workbook workbook = new Workbook(dataDir+ "book1.xlsx");

// We get the Percent style and create a style object.
Style style = workbook.GetNamedStyle("Percent");

// Change the number format to "0.00%".
style.Number = 11;

// Set the font color.
style.Font.Color = System.Drawing.Color.Red;

// Update the style. so, the style of range "A1:C8" will be changed too.
style.Update();

// Save the excel file.	
workbook.Save(dataDir+ "book2.out.xlsx");