Thanks @poisonapple for your response,You will have to apply for new work permit ..pls call CIC and check if you can go to border with CSQ , new offer letter and accompanied fees receipt (paid by your employer) and they can issue new work permit at border ..
But I'm not a visa exempted person (my Visitor visa yet not issued), so I doubt that I can go to broader, I'm afraid they will not allow me to enter To Canada again .......What you think ??