private void deleteCurriculum(TblCurriculums curriculum)
{
foreach (TblStages stage in TeacherHelper.StagesOfCurriculum(curriculum))
{
deleteStage(stage);
}
//remove permissions
ServerModel.DB.Delete <TblPermissions>(TeacherHelper.AllPermissionsForCurriculum(curriculum));
ServerModel.DB.Delete <TblCurriculums>(curriculum.ID);
}