List<string> list = new List<string>();
            ArrayList dsQuestionNumber = dac.getQuestionNumberList(txtFormName.Text);

            for (int i = 1; i < 151; i++)
            {
                list.Add(i.ToString());
            }

            foreach (string s in new System.Collections.ArrayList(dsQuestionNumber))
            {
                list.Remove(s);
            }

            string[] terms = list.ToArray();