[Gos_pira]

What's the point of extending if you still need to use the "as" expression? Seems rather retarded to me.

It would make sense if you used it in a foreach on an array of objects of different type.

Like:

"foreach (djur as Animal in this.Animals)"

while this.Animals contains Dog, Cat, Parrot etc.

I might just be misunderstanding something here, if so, disregard my post.