how to log the operation of business object in an elegant way by using design pattern?

For example I have two class call Log,and Order,Order is a business object. If i need to log the insert operation of business object Order.Then i have to do something like that:

public class Order
{
  IOrderDal dal = DALFactory.DataAccess.CreateOrder();
  logger = new Logger();
  public void Inerst(OrderInfo order)
  {
    dal.Insert(order);
    logger.log(orderInfo.ToString(),"Insert",DateTime.Now.ToString());
  }
public class Logger
{
  public void log(string description,string operation,string time)
  {
    ....//dosometing to persist the information
  }
}

My question is that if i have hundreds of business object need to be logged,then i have to add the code like logger.log(orderInfo.ToString(),"Insert",DateTime.Now.ToString()) in each operation of bussiness objects?I think there must be some desgin methodlogy to make life easier.