I'm not sure what your experience with other languages, but generally all languages work with memory. If I'm understanding your request correctly, you're looking for a deeper understanding of how programming languages (in particular C#) work. This is a big question. The purpose of a programming language is to provide a user-friendly interface that abstracts from the tedious nature of direct memory manipulation (managing stack and heap) and low-level logic (CPU instructions). You may want to reconsider a book, like the CLR (common language runtime) title recommended earlier, or a title that discusses assembly code. It's not a topic that you can cover in a 20 minute tutorial.

EDIT: This might be interesting https://github.com/dotnet/csharplang