public ICollection <WordDC> GetNotLearnedWords(int quantityWords, int dictionaryId) { try { List <WordDC> listWordsDC = new List <WordDC>(); var listWordsDTO = _bll.GetNotLearnedWords(quantityWords, dictionaryId); listWordsDTO.ForEach(x => listWordsDC.Add(MappingWord.MappingDTOtoDC(x))); return(listWordsDC); } catch (Exception ex) { throw new FaultException(ex.ToString()); } }