As title says, it's a great package that simplifies dealing with Excel files.
It's open-source: https://github.com/ClosedXML/ClosedXML
I created a sample CLI to create a spreadsheet to track daily electricity costs for demo purposes: https://github.com/Dev-Power/programmatically-manage-excel-spreadsheets-with-dotnet/tree/main
You can also find the accompanying blog post for more details: https://devpower.co.uk/dotnet/csharp/programmatically-manage-excel-spreadsheets-with-dotnet/
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