how to handle the business object among the layers

See more:

C#

WCF

Hi friends

I am having the following layers in my application.

1) Business Objects Layer: a separate project that keeps only entity definitions
2) Data Access Layer : Crud operations on objects
3) Business Layer : object operations (Save,Delete,Update,insert)
4) Service Layer : Exposing the service for Objects
5) Client : Consuming the services.

My question is that how I can maintain the Business Objects among the layers. I want to traverse the object between the layers. But I don’t know exactly how to implement this.

Suppose I have a Product Object in business object layer,Now I want the following.

1)How to expose this object with the Service layer, will I have to duplicate the product object in service layer as well as at the client side?


Here is the sample code for your review.


Business Objects Layer :

Public class Product
{
Private string Name;
Private string Code ;
…
}

Business Layer :

Public bool Save(Product objProduct)
{
…
}

Data Access Layer :

Public bool Save(Product objProduct)
{
…
}

Service Layer

[ServiceContract]
 public interface IProduct
    {
        [OperationContract]
        save(product objproduct);
         }

public class product : IProduct
    {
        Public void save(product objproduct);
         }

Client :

ProductService ProductClient = new ProductService();
ProductClient.open();
Product  p = new product();
p.name="abc";
p.code="001";
ProductClient.save(P);
ProductClient.Close();

Please guide me.

Many appreciations !!