title: Find missing items in a List<T>
body: <p>Can someone convert this to C# LINQ for me please ??</p>
  
  <pre><code>SELECT *
  FROM   vf
         LEFT JOIN dbvf
         ON     vf.sid  =dbvf.sid
         AND    vf.cid  =dbvf.cid
  WHERE  dbvf.sid IS NULL
  </code></pre>
  
  <p>Both vf and dbvf are <code>List&lt;T&gt;</code>. sid and cid are integers.</p>
  
  <p>What I am trying to do is find items in vf that are missing in dbvf.</p>