title: Lightswitch 2012, using EF to query not attached datasources
body: <p>I have a <code>LightSwitch project</code> with a <strong>attached database</strong>, but I want to fill a control of one of my screens with data from a data source which <code>can't be attached</code>.</p>
  
  <p>To connect with this data source I must use a <code>value of my model as Connection string</code>.</p>
  
  <p>Which is the best way? </p>
  
  <p>Thanks</p>