Does the using statement dispose only the first variable it create?

Question

Let's say I have a disposable object MyDisposable whom take as a constructor parameter another disposable object.

using(MyDisposable myDisposable= new MyDisposable(new AnotherDisposable()))
{
     //whatever
}

Assuming myDisposable don't dispose the AnotherDisposable inside it's dispose method.

Does this only dispose correctly myDisposable? or it dispose the AnotherDisposable too?

Answer 1

using is an equivalent of

MyDisposable myDisposable = new MyDisposable(new AnotherDisposable());
try
{
    //whatever
}
finally
{
    if (myDisposable != null)
        myDisposable.Dispose();
}

Thus, if myDisposable does not call Dispose on AnotherDisposable, using won't call it either.