title: How to workaround "Contains" for .net 3.5 don't support
body: <p>I write a linq to Entity:</p>
  
  <pre><code>string[] groups = GetGroups();
                  var fList = from f in _store.wcf_ServerFarm
                                 join a in _store.ClientAccess on f.ServerFarmName equals a.AccessServerFarmName
                                 join s in _store.Service on f.ServerFarmName equals s.ServerFarmName
                                 where groups.Contains(s.ServerMachineName)
                                 select new { f.ServerFarmAddress, s.ServerMachineName, s.ServiceName, s.ServiceConfig, s.ServicePath };
  </code></pre>
  
  <p>But .net 3.5 didn't support Contains(), I couldn't upgrade it for some reason. how to figure out it. I try to use "Any(), esql" and so on ,didn't work.
  Thanks! </p>