public string Delete(int Id, string CurrentUsername)
        {
            Assessment Assessment = FindById(Id, CurrentUsername);

            if (Assessment != null)
            {
                return(AssessmentRepository.Delete(Id) ? null : Messages.IssueInDatabase);
            }
            else
            {
                return(Messages.NotFound);
            }
        }
 public void DeleteAssessments(Assessment assessment)
 {
     _assessmentRepository.Delete(assessment);
     OnPropertyChanged(nameof(Assessments));
 }