❔ How to structure project and import items?

I'm just starting with C#, and I'm having trouble understanding how project structure and importing works.

I come from Rust where you can import a single item from a module with something like

use the_module::TheItem;

use the_module::TheItem;

You can also import multiple items using this notation:

use the_module::{Item1, item_2};

use the_module::{Item1, item_2};

I tried something similar in C#:

using my_namespace.TestClass;

using my_namespace.TestClass;

But that gives an error

Namespace name expected ...

Namespace name expected ...

. Is it not possible to only import some items from a namespace?

I'm also having trouble understanding the relationship between namespaces and files. It seems like you can add stuff to a namespace from anywhere inside your project. So it seems like namespaces are not really self-contained modules, but more like heaps where you can throw in anything semi-related to some concept.

Finally it seems to me like you can't have items private to a module?

This all seems rather unstructured to me, so surely I must be missing something. I can summarize my questions as such:
1. Can you import only specific items?
2. What's the idiomatic way to structure complex libraries? namespace per file?
3. What are the tools to restrict visibility such that I can have parts of my library that are only available internally?

Please bear in mind I'm not familiar with "old-school" OOP stuff so I might be oblivious to the obvious

I would highly appreciate it if you could explain how it works.

❔ How to structure project and import items?

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