title: LINQ to SQL: how to update the only field without retrieving whole entity
body: <p>I want to update the only field of entity when I know entity Id. </p>
  
  <p>Is it possible in LINQ to SQL without retrieving full entity (with all fields from DataContext that is overhead) ? Is it possible to create and attach entity to DataContext and mark the exact field(s) to synchronize on DataContext.SubmitChanges (or something like that)?</p>
  
  <p>Thank you in advance! </p>