Really, I tried everything, and there is no solution that works for me. WMI - everything perfect, but I can't change ip address when there is no connection. O_o Are you joking me? How can I make a connection without correct Ip-address? IPHelper - not doing anything. Just adding address to the table. Not work after reboot. netsh - the stupid way I think, but ok, if you don't no another ways you can try. Before you will know, that network adapters name can contain international characters. Did someone know how it works actually, I mean inside? Registry - working after reboot. I don't want to reboot. May be someone know how to notify about reg entries changes?