Convert Excel files to HTML in C#

        var workbook = ExcelFile.Load("officeDials.xlsx");
        var worksheet = workbook.Worksheets[0];
        worksheet.PrintOptions.PrintHeadings = true;
        worksheet.PrintOptions.PrintGridlines = true;
worksheet.NamedRanges.SetPrintArea(worksheet.Cells.GetSubrange("A2", "C33"));
   var options = new HtmlSaveOptions()
        {
            HtmlType = HtmlType.Html,
            SelectionType = SelectionType.EntireFile
        };
        workbook.Save("officeDials.html", options);