title: Linq to Sql join two tables
body: <p>I have such database structure (1 - one, 0 - many)</p>
  
  <pre><code>Product 1-&gt;0 Orders 0-&gt;1 Users
  </code></pre>
  
  <p>I need to find all users for specified product, I have started writing linq query but don't know how to finish it.</p>
  
  <pre><code>public IQueryable&lt;User&gt; GetUsers(int productId)
  {            
    return _db.Products.First(p =&gt; p.Id == productId)....
  }
  </code></pre>