title: UserPrincipal - filter by multi values on a property
body: <p>I need to get all the users where the employeeType != G, J and L
  All the examples I see for query-by-example are for a <em>single value</em>..
      UserPrincipal qbeUser = new UserPrincipal(ctx);
      qbeUser.Name = "Bruce";
      PrincipalSearcher srch = new PrincipalSearcher(qbeUser);
      ... Blah </p>
  
  <p>How would I do this.. Notice this is a NOT equal to and it is several values for a single property..</p>
  
  <p>Thanks in advance.</p>