protected void Page_Load(object sender, EventArgs e)
 {
     if (!IsPostBack)
     {
         ViewState["surrentPage"] = 0;
         OA  mOA     = new OA();
         int PageSum = mOA.GetPages();
         ShowPages.Text = "第" + (Convert.ToInt32(ViewState["surrentPage"]) + 1).ToString() + "页/共" + PageSum + "页";
         divide mdv = new divide();
         this.OrderList.DataSource = mdv.OrderShow(Convert.ToInt32(ViewState["surrentPage"]));
         this.OrderList.DataBind();
     }
 }
        /// <summary>
        /// 上一页
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        protected void last_Click(object sender, EventArgs e)
        {
            if (Convert.ToInt32(ViewState["surrentPage"]) > 0)
            {
                ViewState["surrentPage"] = Convert.ToInt32(ViewState["surrentPage"]) - 1;
                divide mdv = new divide();
                this.OrderList.DataSource = mdv.OrderShow(Convert.ToInt32(ViewState["surrentPage"]));
                this.OrderList.DataBind();
            }
            else
            {
                this.Page.ClientScript.RegisterStartupScript(this.GetType(), "", "<script language='javascript'>alert('" + "已经是第一页!!" + "');</script> ");
            }
            OA  mOA     = new OA();
            int PageSum = mOA.GetPages();

            ShowPages.Text = "第" + (Convert.ToInt32(ViewState["surrentPage"]) + 1).ToString() + "页/共" + PageSum + "页";
        }