/// <summary>
        /// 刷新第三个标签页中Gridview的显示状态.(进行绑定操作)
        /// 需要操作界面中的控件 所以讲函数放在了这里.
        /// </summary>
        /// <param name="skno">上课编号</param>
        private void dp_BindDataSourceForThirdClassStatusGridView(long skno)
        {
            var classInfoDatatable = OfflineDataControl.GetClassInfoTable(skno); // 获取ClassInfo表

            classInfoDatatable.DefaultView.Sort = "上课日期 DESC";                   // 按照日期 降序排序

            rollCallingDetailGview3.DataSource = classInfoDatatable;             // 绑定刚才得到的datatable
        }
        /// <summary>
        /// 刷新第一个标签页中Gridview的显示状态.
        /// </summary>
        /// <param name="kkno">上课编号</param>
        private void dp_BindDataSourceForFirstClassStatusGridView(long kkno)
        {
            var classInfoDatatable = OfflineDataControl.GetClassInfoTable(kkno);

            classInfoDatatable.DefaultView.Sort = "上课日期 DESC";

            classInfoGview1.DataSource = classInfoDatatable;
        }