cwp42 wrote: Do you think that it is a good way / usuall way to create the GUI in C# and the programming logic in C++ ? good is a relative term, and outside of jokes or a nudge in the ribs, you won't get me to say one thing is always better than another. Is it useful? yes. Is it always the best approach? no. Is it a good idea? maybe, sometimes. _________________________ Asu no koto o ieba, tenjo de nezumi ga warau. Talk about things of tomorrow and the mice in the ceiling laugh. (Japanese Proverb)