AspNetPager 分页回到第一页问题。

Question

我这里有个页面类似相册页面
分为两个显示区域a和b；
b的内容是DataList绑定的照片缩略图列表。a接收参数显示的是照片大图，问题是：在查看第二页的某张照片时，分页部分就会回到第一页。这个问题应该怎么解决？以下是处理的源代码，拆分成两个frame的方法忽略。
<webdiyer:aspnetpager id="AspNetPager1" runat="server" onpagechanged="AspNetPager1_PageChanged"
        showcustominfosection="Left" width="400px" 
    CustomInfoHTML="第%CurrentPageIndex%页，共%PageCount%页，%PageSize%条/每页" 
    PageIndexBoxStyle="width:19px" NumericButtonCount="5" 
            ShowMoreButtons="False"></webdiyer:aspnetpager> protected void Page_Load(object sender, EventArgs e)
        {
           Users.checkLogin();//登陆检测
           Tools.checkUrl();//是否外部提交
            //
            //参数处理
            //
            if (!IsPostBack)
            {
                if (Request.QueryString["tag"] == "delsuccess")
                {
                    Literal1.Text = "上一张照片已经删除！";
                }
                else if (Request.QueryString["tag"] == "delfailed")
                {
                    Literal1.Text = "对不起你的照片删除失败！";
                }
                if (Convert.ToInt64(Request.QueryString["pid"]) > 0)
                {
                    pid = Convert.ToInt64(Request.QueryString["pid"]);
                }
                else
                {
                    pid = Photos.GetPicID(Session["uid"]);
                }
                p_path = Photos.GetPicUrl(pid);
                //int return_num;
                Image1.ImageUrl = p_path;
                Image1.Attributes.Add("OnLoad", "javascript:DrawImage(this,360,480)");                pindex = Convert.ToInt32(Request.QueryString["pindex"]);
                Button2.Attributes.Add("onclick", "javascript:if(!confirm('你确定要删除该照片吗？')) { return false; }");
                
                SqlParameter[] para = new SqlParameter[1];
                para[0] = new SqlParameter("@in_uid", Convert.ToInt64(Session["uid"]));
                int totalOrders = (int)SqlHelper.ExecuteScalar(CommandType.StoredProcedure, "sp_wPhoto_GetNumByUid", para);
                AspNetPager1.RecordCount = totalOrders;
                bindData();
            }
        }
        void bindData()
        {
            using (SqlConnection conn = new SqlConnection(SqlHelper.ConnectionStringLocalTransaction))
            {
                //打开连接
                conn.Open();
                SqlParameter[] para = new SqlParameter[3];
                para[0] = new SqlParameter("@in_uid", 65);
                para[1] = new SqlParameter("@startIndex", AspNetPager1.StartRecordIndex);
                para[2] = new SqlParameter("@endIndex", AspNetPager1.EndRecordIndex);
                DataList1.DataSource = SqlHelper.ExecuteReader(SqlHelper.ConnectionStringLocalTransaction, CommandType.StoredProcedure, "sp_wPhoto_Page", para);
                //SqlHelper.ExecuteReader(SqlHelper.ConnectionStringLocalTransaction, CommandType.Text, sqlexec, null);
                //DataList1.DataSource = SqlHelper.ExecuteReader(SqlHelper.ConnectionStringLocalTransaction,CommandType.Text, sqlexec, null),);
                DataList1.DataBind();
            }
        }
        protected void AspNetPager1_PageChanged(object src, EventArgs e)
        {
            bindData();
        }