private void delQuiz(object sender, RoutedEventArgs e)
        {
            mainDal m = new mainDal();

            string val = delVal.Text;
            int    id  = 0;

            try
            {
                id = int.Parse(val);
            }
            catch
            {
                delVal.Text = "Enter Valid id";
            }

            m.deleteQuiz(id);
        }