C# doesn't have RAII, immutable, nor the notion of threadlocal/shared types.

...a scope delegate, and probably something as RAII to create it and delete it when...

...would be MP. "synchronized" is better
than RAII/scope because it gives the compiler more...

...güçlü olanaklarından birisi! C++'ta olsa bir RAII sınıfı yazmak zorunda kalırdık veya daha da...

...Phobos, and because it was getting usable enough. (And because I really
wanted RAII structs.)

...but made with ranges in mind, using RAII/refcounting and again, very minimal.

API is...

That's more or less what people have already said.  What's more, Ashish has...

That should have been int main.

Just implement your own exception type, e.g. ExitException, and then use:

void main() { try...

...in order to call scope guards and RAII, it would need to unwind the call...