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    <p>That's not bad at all. Very similar to our setup.</p> <p>Couple of pointers:</p> <p>1 - Use generics for your Repositories. Your code for Attach is very simple, and should not need to be duplicated amongst entities. If you created a <code>GenericRepository&lt;T&gt;</code>, then your attach code would be:</p> <pre><code>public T Attach&lt;T&gt;(T entity) where T : class { Context.GetEntitySet&lt;T&gt;.Attach(entity); // pluralization on (typeof)T.name to get entity set Context.ObjectStateManager.ChangeObjectState(entity, EntityState.Modified); return entity; } </code></pre> <p>2 - I would seperate the <code>UpdatePhones</code> method into seperate methods. I wouldn't rely on a flag (IsDeleted, etc) to determine the course of action. I would be more explicit.</p> <p>3 - Looks like you have a <code>PhoneRepository</code>? Why? <code>Person</code> is your aggregate root, and <code>Phone</code> is always related to a particular <code>Person</code>, therefore you should only have a <code>PersonRepository</code> in this aggregate boundary. You should be attaching to the <code>Phones</code> ObjectSet` of a particular person.</p> <p>BTW - i assume you have <em>lazy loading</em> disabled? If not, those LINQ operations over the ICollection will cause silent round trips.</p> <p>Apart from the above points (which are mainly design related), optimization-wise your code looks good to me.</p> <p>And a final note - there is another recommended technique (Alex James) for updating entities in a detached context (aka MVC) called the "stub techinque".</p> <p>I asked a question (and solved it myself) a few days ago if your interested, <a href="https://stackoverflow.com/questions/4221275/entity-framework-4-where-to-put-applycurrentvalues-logic">check it out</a>.</p> <p>HTH.</p>
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