Bytescout.XLS is a library to add to.NET applications (such as Visual Basic.NET, C #, ASP.NET) which will allow you to create spreadsheets from both MS Excel and OpenOffice, that is, XLS extension files (from Excel), XSLX, ODS or CSV.
At no time is it necessary to have installed neither the MS Excel nor the Open Office for its correct operation, allowing to create by source code (thanks to the use of the library) all kinds of cells, columns, ranges, insert texts, generate formulas, format (style, fonts, sizes, colors), etc.
Bytescout.XLS also allows you to export the resulting spreadsheet files to HTML.
You can free download Bytescout.XLS 32, 64 bit and safe install the latest trial or new full version for Windows 10 from the official site.