List<WorkerMove> Rank = new List<WorkerMove>();
var idRank = (from rank1 in context.Worker select rank1.codeWorker);

foreach (var read in idRank)
 {
  WorkerMove Rank3 = (from rank2 in context.WorkerMove
                      where rank2.idWorker == read
                      select rank2).FirstOrDefault();

  if(Rank3 != null) Rank.Add(Rank3);
 }

 var workerSurname = from worker in context.Worker
     join workMove in Rank on worker.codeWorker equals workMove.idWorker
     join workRank in context.Dol on workMove.idRank equals workRank.idDol
     select new
     {
      codeWork = worker.codeWorker,
      Fio = worker.Family+ " " + worker.Name.Remove(1) + "." + worker.Otch.Remove(1) + ".",
      Dol = workRank.Dol,
     };