Doubt in linq to sql Select method in 3 Tier architecture

Question

Friends i am working on 3 tier architecture

As  Data Tier, Middle Tier, Presentation tier

In Data Tier---> It consist of Linq To sql File (ie dbml) with stored procedures.

   Middle Tier--> Contains Business Entity Objects, Business Logic Layer, Service Layer.

                  In Business Logic Layer, i have coded the insert method(refered BEO, Data Tier)
                                        
                  In Service Layer, I have called the insert method from business layer.(refered BEO, BLL)

 Presentation Tier--> I called the service Layer(refered BEO, service layer).

I followed this way to insert but when tried to do select method i didnt get the correct follow as mentioned above.


Please help me with clear sample and idea.