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Bro i have offer letter of this college and i want to know does business program can be problem for getting visa as i wasn't student of commerce..

It's fine since you are going into undergraduate. You just need to explain why you are switching into Business when you write your SOP.
 
A college degree in business does not get you very far in terms of employment opportunities. It would be much better to do a BCom in your home country and pursue graduate work in Canada.