It would help a lot if you give explicit, technical details. You say it only saves Warenspeichersystem.Artikel yet you declare your list as public static List<Artikel> in the namespace Warenspeichersystem, so the list is only meant to save that type of object. Without actually setting up a project and running your code we can't tell what's wrong, and most of us have better things to do.

i didn't knew that, if you want to i'll go to a voice channel and stream my ide there

i'm in #827982932311408650

I prefer to just help you here, that way other people can also benefit from us finding a solution, plus I have a sore throat

i've got it, thanks anyways

the problem was that i did not have a override

Aha, cool