Cross-Platform?!
I just read cross-platform and was totally excited. But as far as I read, the Mono framework wasn’t mentioned so I don’t think developing on Unix like machines would be possible. The app itself is nice to look at but most probably not suited for beginners. You should own a Windoze or Mac computer, built your first application in C# and also had a look into mobile app building. And don’t forget app building for iOS is closed up by apple… @Developer: Please exactly describe what and how you can do things with „Invention Manual“.
