Hi Ramesh,
Thanks for your posting and using Aspose.Cells.
If you manually save the Excel file containing the double underline into HTML, and then open the HTML file in the browser, you will see that double underline is rendered as single underline. So, this is not the issue of Aspose.Cells but a limitation of Excel and the browsers as they do not support double underline.
I have attached the sample xlsx file and the Excel saved HTML file for your reference.
Thank you Shakeel, for the quick reply.
Hi Ramesh,
Thanks for your posting and using Aspose.Cells.
We are afraid, you cannot achieve this functionality through Aspose.Cells. Besides double under line is not supported in HTML also, so it is the limitation of HTML itself.