public void BindTopic()
{
DataClassesDataContext db = new DataClassesDataContext();
Exam exam = db.Exam.First(t => t.ExamId == decimal.Parse(examId));
theExamId = exam.TheExamId.ToString();
if (exam == null)
{
alert("获取试卷信息失败！", "AllExam.aspx");
}
examName = examBll.GetExamName(exam);
topics = examBll.GetPracTopicByExamId(ref pageNumber, ref totalPage, ref count, examId);
}