private string GetModeloId() { char lastId; string modeloId = ""; Modelo lastModel = _modeloRepository.GetLastModelo(); if (lastModel == null) { return("A"); } lastId = lastModel.ModeloId[lastModel.ModeloId.Length - 1]; char newId = GetLetter(lastId); if (lastId == 'Z') { for (int i = 0; i < lastModel.ModeloId.Length + 1; i++) { modeloId += newId; } } else { for (int i = 0; i < lastModel.ModeloId.Length; i++) { modeloId += newId; } } return(modeloId); }