Export data to CSV file in C++.NET from ASP.NET web pages, windows applications, winforms, console applications! Spreadsheets in .NET.
https://www.easyxls.com/manual/tutorials/cpp-net/export-data-to-csv-file.html

Export data to XLSB Excel file in C++.NET from ASP.NET web pages, windows applications, winforms, console applications! Spreadsheets in .NET.
https://www.easyxls.com/manual/tutorials/cpp-net/export-data-to-xlsb-file.html

Export data to XLS Excel file in C++.NET from ASP.NET web pages, windows applications, winforms, console applications! Spreadsheets in .NET.
https://www.easyxls.com/manual/tutorials/cpp-net/export-data-to-xls-file.html