internal void Delete(int id)
 {
     using (GlobalDBContext dBContext = new GlobalDBContext())
     {
         Student student = dBContext.Student(true)
                           .Where(s => s.ID == id)
                           .FirstOrDefault();
         if (student != null)
         {
             dBContext.Remove(student);
             dBContext.SaveChanges();
         }
     }
 }