Should my DAL return Person or Datatable?

Question

After reading this , I still have a question :

I use this code to query the db :

c# :

new BLL().GetPersonById(1)

BLL :

public Person GetPersonById(int id)
{
  return new DAL ().GetPersonById(1);
}

DAL :

public Person  GetPersonById(int id)
{
   // goto db and create instance of Person and fill its data...
}

However , am I doing it wrong ,

Should my DAL return DataTable instead ? ( so the BLL will create Person .... ?)

DAL :

public DataTable  GetPersonById(int id)
{
   // goto db ...
}

Thank you.

Edit :

the Person object is defined in BE dll ( business entity).

Answer 1

"Should my DAL return DataTable instead ? ( so the BLL will create Person .... ?)"

Not at all. Ideally DAL is supposed to deal with database and should return entity/application objects to BAL. DAL works as a abstraction for database to BLL.

And I am agree with MikeSW as he said "BLL shouldn't depend on the DAL, at most it defines some interfaces which will be implemented in the DAL."