OpenXML
If you are seeing this page you have likely followed a very (15+ years) old and outdated link with details on how to use OpenXML to create Excel documents in .Net.
Please see below for a list of current resources that may be helpful:
GitHub - dotnet/Open-XML-SDK: Open XML SDK by Microsoft
Open XML SDK by Microsoft. Contribute to dotnet/Open-XML-SDK development by creating an account on GitHub.
dotnet
link to OpenXML SDK on GitHub
Creating Excel File Using OpenXML
In this article I will explain how to create an Excel file using C# without any third party paid dll files or Microsoft Interop services, but OpenXml dll, which is free and available in a nuget package.
Rafnas T P
C# Corner article on creating Excel files
Create Excel using OpenXML in .NET 6
Often times, we need to export data into external file. We can use .csv file, but it does not have the capability to format the data…
Jason Ge
Medium article on creating Excel files with OpenXML in .Net 6