public virtual void edit(IModelView obj)
        {
            var objPersistance = _converterModel.EditPersitance(obj);

            if (_validationService.ValidarGrabar(objPersistance))
            {
                _db.Entry(objPersistance).State = EntityState.Modified;
                try
                {
                    _db.SaveChanges();
                }
                catch (DbUpdateException ex)
                {
                    if (ex.InnerException != null &&
                        ex.InnerException.InnerException != null)
                    {
                        var inner = ex.InnerException.InnerException as SqlException;
                        if (inner != null)
                        {
                            if (inner.Number == 2627 || inner.Number == 2601)
                            {
                                throw new ValidationException(General.ErrorRegistroExistente);
                            }
                        }
                    }

                    throw;
                }
                catch (DbEntityValidationException ex)
                {
                    // Retrieve the error messages as a list of strings.
                    var errorMessages = ex.EntityValidationErrors
                                        .SelectMany(x => x.ValidationErrors)
                                        .Select(x => x.ErrorMessage);

                    // Join the list to a single string.
                    var fullErrorMessage = string.Join("; ", errorMessages);

                    // Combine the original exception message with the new one.
                    var exceptionMessage = string.Concat(ex.Message, " The validation errors are: ", fullErrorMessage);

                    // Throw a new DbEntityValidationException with the improved exception message.
                    throw new DbEntityValidationException(exceptionMessage, ex.EntityValidationErrors);
                }
            }
        }