private void LoadExam()
        {
            Online_Exame exams     = new Online_Exame();
            var          examQuest = exams.getExam_Question(examID);

            list           = examQuest.ToList();
            StudentAnswers = new Dictionary <int, string>(list.Count);

            // show Exam details
            var examInfo = (from e in exams.Exams where e.Ex_id == examID select e).First();

            label1.Text = examInfo.Ex_Des.Trim();
            label2.Text = examInfo.Duration.ToString() + "M";
        }