Verify the type of NOC...if it says No Objection to Transfer Sponsorship, then congratulations! Otherwise, if NOC is only No Objection to work in another company, the VISA is retained in your employer. NOC to transfer sponsorship is the ONLY NOC recognized by immigration to be elligible for transfer. The latter, you can come back and work, but the moment they cancel your VISA, you are bound to go home.