Underappreciated aspects of the C# compilation model:

1: file agnostic. While files provide a scope for imports, in general the compiler can’t tell the difference between the same set of classes split across multiple files or crammed into the same file.

2: unordered - files don’t import one another, or get processed in particular sequence. The compiler takes a set of files and turns that into a set of type definitions.

2: partial types, which lets you even split a class definition between multiple files

3: regions, to let you bracket of sections within a file and organize things how you want.

No ‘one class per file’ rules. No ‘references at the top of the file to every other file you need’. You can reorganize code freely, adding or combining files at will.