ClosedXML

[Costas]

Is a .NET library for reading, manipulating and writing Excel 2007+ (.xlsx, .xlsm) files. It aims to provide an intuitive and user-friendly interface to dealing with the underlying OpenXML API.

https://github.com/ClosedXML/ClosedXML

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There are multiple root elements

https://github.com/ClosedXML/ClosedXML/issues/894