GoToPage

private void GoToPage(int pageIndex)
{
   // 准备事件数据
   PageChangedEventArgs e = new PageChangedEventArgs();
   e.OldPageIndex = CurrentPageIndex;
   e.NewPageIndex = pageIndex;

   // 更新当前的索引
   CurrentPageIndex = pageIndex;

   // 启动页面更改事件
   OnPageIndexChanged(e);

   // 绑定新数据
   DataBind();
}

SELECT * FROM
(SELECT TOP ItemsPerPage * FROM
(SELECT TOP ItemsPerPage*CurrentPageIndex * FROM
(SelectCommand) AS t0
ORDER BY SortField ASC) AS t1
ORDER BY SortField DESC) AS t2
ORDER BY SortField