Update Sum columns

[davidmost]

Summary

Update SumColumns and related items, adopting LINQ throughout for better thematic alignment with the chapter, ensuring greater conciseness, flexibility, and practicality.

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Internal previews

📄 File	🔗 Preview link
docs/csharp/linq/how-to-query-files-and-directories.md	How to: Use LINQ to query files and directories

[BillWagner]

Hi @davidmost

This overall looks good. Can you agree to the Contributor License Agreement (CLA)? After that's done, I can merge this.

[davidmost]

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[davidmost]

Hi @davidmost

This overall looks good. Can you agree to the Contributor License Agreement (CLA)? After that's done, I can merge this.

Hi @Bill Wagner

I'm new to GitHub and still figuring things out. I think I just completed the CLA.

[BillWagner]

Thanks @davidmost

This looks great, and I'll now.

You should see the changes on the live site in the next day or two, on our regular publishing cycle.

Thanks for contributing to docs! 🎆