Log4Net : Debug vs Info?

In Log4Net, What is the difference between Debug method and Info method ? Generally when should i use one over the other ?

Ex :

try

{

 // updating the customer object

 log.Info ("before loading current customer");     //1
 Customer objCustomer=GetCurrentLoggedInCustomer();
 log.Info ("Current customer loaded ");  //2
 objCustomer.LastName="New name";
 log.Info("Before saving");   //3
 objCustomer.Save(); 
 log.Info("Saved");     //4

}
catch(Exception ex)
{
    log.Error(ex.Message);  //5
}

Should i use Debug method in 1,2,3,4 positions ?