// 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);

Workbook workbook = new Workbook();

Worksheet worksheet = workbook.Worksheets[0];

Cell cell = worksheet.Cells["A1"];
cell.HtmlString = "<Font Style=\"FONT-WEIGHT: bold;FONT-STYLE: italic;TEXT-DECORATION: underline;FONT-FAMILY: Arial;FONT-SIZE: 11pt;COLOR: #ff0000;\">This is simple HTML formatted text.</Font>";

workbook.Save(dataDir + "output_out.xlsx");