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";
}