How To: Validate IMEI on C# .Net App

hi, i did a tuto for show how to make a validator on .Net with c#

i know a lot of us know how to do this but there are some beginners who need to know how to do that, so the tuto is in spanish lang but i has been used tutos on Russian and i dont speak russian, also i dont speak english just can write an read a little… but to finish i hope it can help to someone 😉