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    <p>Make a class Phone and change the User property accordingly:</p> <pre><code>public class Phone { public int Id { get; set; } public int UserId { get; set; } public string Number { get; set; } } public class User { // (etc) public List&lt;Phone&gt; Phones { get; set; } // (etc) } </code></pre> <p>Make a PhoneRepository:</p> <pre><code>public class PhoneRepository { public List&lt;Phone&gt; LoadPhonesFromId(IEnumerable&lt;int&gt; ids) { // write a query with the ids // SELECT * FROM Phones WHERE id IN (@id1, @id2, ...) // execute the query // convert the results to Phones and put them in a List&lt;Phone&gt; // return the list } public List&lt;Phone&gt; LoadPhonesFromUserId(IEnumerable&lt;int&gt; userIds) { // write a query with the userIds // SELECT * FROM Phones WHERE userId IN (@userId1, @userId2, ...) // execute the query // convert the results to Phones and put them in a List&lt;Phone&gt; // return the list } } </code></pre> <p>And a UserRepository:</p> <pre><code>public class UserRepository { public List&lt;User&gt; LoadUsersFromUserIds(IEnumerable&lt;int&gt; userIds) { // write a query with the userIds // SELECT * FROM User WHERE id IN (@id1, @id2, ...) // execute the query // convert the results to Users and put them in a List&lt;User&gt; // return the list } public void IncludePhones(IEnumerable&lt;User&gt; users) { var phones = PhoneRepository.LoadPhonesFromUserId (users.Select(x =&gt; x.Id)); for each(var user in users) { user.Phones = phones .Where(x =&gt; x.UserId == user.Id) .ToList(); } } } </code></pre> <p>You can greatly expand and improve on this pattern with, for example, custom filter parameters (instead of different functions for the various filters) and property setters that make sure the user and user.Phones keep referring to the same userID, but that is sort of beyond the scope of your question.</p>
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    1. USJan Van Herck
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    1. COthanks for Your suggestion, this is almost the same code as I have right now, except that I have all inside one method. This works fine, but as I wrote I would like to avoid multiple queries, but as I see this is almost impossible, especially user may not have any phones at beginning.
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    2. COsorry for my silly comment :) I can do load with just 2 queries instead of n. For now I'll stay with this solution. Thanks!
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