title: LInq left join with multiple condition in on clause
body: <p>I have a join in SQL I need to write it in linq here is the <code>select</code> statment:</p>
  
  <pre><code>select * from products p
  left join customer cust
  on((cust.identifier = p.orgID or cust.identifier = p.personalno) and cust.identifier is not null);
  </code></pre>
  
  <p>How can I write this statement in linq?</p>