public void DeleteSectionsForExam(int examId)
{
var sections = _context.Sections.Where(section => section.ExamId == examId);
_context.RemoveRange(sections);
}
public void DeleteQuestionsForSection(int sectionId)
{
var questions = FindAll(question => question.SectionId == sectionId);
_context.RemoveRange(questions);
}