public void Bind()
 {
     if (nowExam == null)
     {
         alert("暂无正在进行的考试", "/Desktop.aspx");
     }
     else
     {
         stus = exambll.ExamTeacherGetStuExamByTheExamId(tId, ref pageNumber, ref totalPage, ref count,
                                                         nowExam.ExamId.ToString(), para);
     }
 }