private void EditData(string id, HttpContext context)
 {
     var stuids = context.Request["StuIds"];
        var courseId = context.Request["CourseId"];
     var msg = "";
     if (!string.IsNullOrEmpty(stuids))
     {
         var stu = stuids.Split('|');
         var questionBll = new BLL.Questionnaire();
         var result = questionBll.EditQuestions(stu, courseId);
         if (!result)
         {
             msg = "保存失败!";
         }
     }
     //  var str = JsonConvert.SerializeObject(new { success = result, errorMsg = msg});
     context.Response.Write(msg);
 }