find objects of specific class from a List<>

I've got a base class, say called `Fruits`. I then have a few child classes of that, say `Banana:Fruit`, `Apple:Fruit`, etc. I then have a list of objects of different types, Banana, Apple, whatever. That looks like this: ``` List<Fruits> f = new List<Fruits>{new Banana(), new Banana(), new Apple(), new Banana()}; ``` I want a function that can take a list of fruits as well as a type, and give me a list with only that type's objects in the list. So if I call `find_obj(f, Banana)`, (or something) it should give me back a list containing only Bananas. I might be showing extreme ignorance here, and I apologise. Is this even possible? I know I could do something like this if I know the class beforehand: ``` public List<Fruit> GimmeBanana(List<Fruit> f) { List<Fruit> Output=new List<Fruit>{ }; foreach(Fruit fr in f) { if (fr is Banana){ Output.Add(fr); } } } ``` But I don't know how to make that work for Any class.