Compare a List with an Array (in .NET)

I thought that an ArrayList automatically up-typed anything you add to it to type Object, and used boxing and unboxing to do so. This means the compiler does not enforce the type you pass in, like a generic list List<> does for you at compile time.

Secondly, an Array (versus an ArrayList) seems even more un-disciplined. It seems you can pile in data of any type, and even more arrays. It then is the job of the programmer to query that array before addressing a cell directly.

thanks