Programing Navision modul

Plz. can any write suggest 4 me a best program language for programing Navision modul?

Well first lets move this into a Navision forum, since it has nothgin to do with CRM. Second, I hope you are not planing to program via SMS over your cell phone. And… Navision has its own development Language, C/SIDE, this is the language you will use to develope Navision applications.