C# has the using-statement + IDisposable which is similar context managers in python (except no __enter__).

C#8 then allowed using-statements that do not require blocks, which then are disposed when leaving the current block.

Pre C#8, you had to have a block, similar to how with-statement requires a block aka indentation

    using (var res = OpenSomeResource()) {
      res.doSomething();
      // res.Dispose() implicitly called
    }

Now you can have this (which is a bit like a go-style Defer but for blocks)

    using var res = OpenSomeResource();
    res.doSomething();
    // res.Dispose() implicitly called at end of current block

Of course, you have to take the potentially longer lifetime into account. This way looks a lot like C++s RAII with constructors and destructors (except the destructor here is the IDisposible.Dispose implementation).