public void DeleteStudent(int userId)
{
List <SubArea> userSubAreas = subAreaController.GetUserSubAreas(userId);
ResetSubAreasProxy(userSubAreas);
List <string> assignmentsToDelete = SubAreaUtils.GetSubAreasStrings(userSubAreas).ToList();
SubAreaAssignUtils.UnAssignSubAreasToUser(userId, subAreaController, assignmentsToDelete.ToArray());
StudentExamController studentExamController = new StudentExamController();
StudentExamQuestionController studentExamQuestionController = new StudentExamQuestionController();
List <StudentExam> allStudentExamIds = studentExamController.GetAllStudentExams(userId);
foreach (StudentExam studentExam in allStudentExamIds)
{
studentExamQuestionController.DeleteAllStudentExamQuestions(studentExam.Id);
studentExamController.DeleteStudentExam(studentExam.Id);
}
userController.DeleteStudent(userId);
}