public void EditPromotion(Promotion element, string username, string password)
{
IManager<Promotion> business = new PromotionBusiness();
business.Edit(element, username, password);
}
public int AddPromotion(Promotion element, string username, string password)
{
IManager<Promotion> business = new PromotionBusiness();
return business.Add(element, username, password);
}