logicum

Microsoft .Net Framework 4.0 ( or any other version) is a set of DLLs used by other software. when you build an application on Visual Studio you are using by default the .Net Framerwork. there for if you take this application to another PC it will require to install the same .Net Framework you built it with PS: when installing visual studio the .net framework is installed with it automaticly

what was the solution , this is interesting ?

it doesn't matter the language, we can go days and days arguing about which is better from which, but at the end of the day all can do the same C is a very good language and one of the oldest, it is the base of c# (.net) and also objective C ( MAC ) java is platform independent language i advice you to learn one of those (most common) ps: again no language is better than the other