/**
  * Delete assignment
  */
 function delete()
 {
     global $ilDB;
     $this->deleteFeedbackFile();
     $ilDB->manipulate("DELETE FROM exc_assignment WHERE " . " id = " . $ilDB->quote($this->getId(), "integer"));
     $exc = new ilObjExercise($this->getExerciseId(), false);
     $exc->updateAllUsersStatus();
 }