title: Entity framework and Exists clause
body: <p>I'm a rookies of EF so, sorry for my perhaps foolish question.</p>
  
  <p>I've 2 entities without any relationship (VS does not load the join and I can't manually add it because the primary key of the child uses a derivated key of its parent).</p>
  
  <p>Example</p>
  
  <p>Entity master<br>
  Products<br>
  keys GKey_K, Product_K<br>
  fields .....  </p>
  
  <p>Entity detail<br>
  GenericInformation<br>
  keys GKey_K, GI_K<br>
  fields Product_K, ....  </p>
  
  <p>Well, my question is simple (I hope also my english!), how I can read only the products that have some reference on GenericInformation?</p>
  
  <p>TIA</p>
  
  <blockquote>
    <p><strong>Possible duplicate:</strong><br>
     <a href="https://stackoverflow.com/questions/1802286/best-way-to-check-if-object-exists-in-entity-framework">Best way to check if object exists in Entity Framework?</a></p>
  </blockquote>