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    <p>In your Domain projects, you define the interfaces for your data acces objects. Your NHibernate persistence project can reference the Domain project and provide implementation for the data access objects. </p> <p>Your service project might reference Domain and <em>not</em> Persistence. Your service objects depend on the data access interfaces in Domain. You use your DI container to wire your service objects to the NHibernate implementations in Persistence.</p> <p>Changing the dependency <code>Domain -&gt; Persistence</code> to <code>Persistence -&gt; Domain</code> is an example of inversion of control.</p> <p>I can imagine you now have the following service:</p> <pre><code>using Persistence; using Domain; public class UserService { private Persistence.NHibernateUserRepository _repository; public UserService (ISession session) { _repository = new Persistence.NHibernateUserRepository(session); // ... } // some service methods } </code></pre> <p>I suggest to change this to:</p> <pre><code>using Domain; // no longer using Persistence package public class UserService { private Domain.IUserRepository _repository; public UserService (Domain.IUserRepository repo) { _repository = repo; // ... } // some service methods } </code></pre> <p>In your StructureMap configuration, you configure an NHibernate Session, which you wire to your <code>Persistence.NHibernateUserRepository</code>. Then you wire your <code>UserService</code> to this <code>Persistence.NHibernateUserRepository</code>. I'm not familiar with StructureMap, so I can't help you with the mechanics. You might want to read:</p> <ul> <li><a href="https://stackoverflow.com/questions/1296901/injecting-isession-into-my-repositories-using-structuremap-in-a-asp-net-mvc-appli">Injecting ISession Into My Repositories Using Structuremap in a Asp.Net MVC Application</a></li> <li><a href="http://www.bengtbe.com/blog/post/2009/02/27/Using-StructureMap-with-the-ASPNET-MVC-framework.aspx" rel="nofollow noreferrer">http://www.bengtbe.com/blog/post/2009/02/27/Using-StructureMap-with-the-ASPNET-MVC-framework.aspx</a> - this is a post that discusses exactly your problem, including StructureMap, NHibernate and asp.net mvc.</li> </ul>
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    1. CO+1 This interface is often called [IRepository](http://stackoverflow.com/questions/2347337/database-abstraction-layer-design-using-irepository-the-right-way)
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    2. COOk, I am using Repositories that are located in Persistence layer, in domain layer are ma POCO entities and DTOs, Problem is in the service layer, i must reference nhibernate because of this: the service layer uses repositories to get entities. but repositories needs ISession injected in constructor, and so I need nhibernate in services. My question was is it possible to somehow propagate dependeny from one project to another without directly add references into project. Somthing like Project2, uses project1, that uses nhibernate. So project 2 can use nhibernate too. Is this possible?
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    3. COI'll edit my answer to clarify.
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