Mixing functional programming and metaprogramming into good-old object-oriented C# is not new. Still, so many programmers don't see it clearly yet: Those paradigms are not additions to an established programming model; they are genuine parts of a unified programming method, support for which is progressively being added to the C# programming language.
In this session, we will demonstrate the use of the latest functional additions to C# - records, tuples, union types, deconstruction, nullable reference types, LINQ, extension methods, and a few others - which will be integrated with object-oriented and even procedural elements into a unified design that effectively solves a practical problem.

This session was presented several times (under different titles): IT Konekt 2021, Sinergija 2021 in Belgrade, NDC Porto 2022, Techorama Antwerp 2022, and Sinergija 2022.
I have written the entire demo and script from scratch several times to always include the latest syntax relevant to the topic.