protected void Page_Load(object sender, EventArgs e)
 {
     if (!IsPostBack)
     {
         GdStudentDeclare.DoDataBind();
         //学年学期视图
         ComBoxTerm();
     }
 }
        protected void RadAjaxManager1_OnAjaxRequest(object sender, AjaxRequestEventArgs e)
        {
            var argument = e.Argument;

            switch (argument)
            {
            case "Delete":
                DeleteTextbook();
                break;

            case "Help":
                //OpenHelpFile("/Help/SystemManage/系统管理.htm");
                break;

            default:
                GdStudentDeclare.DoDataBind();
                break;
            }
        }