protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
         DataList1_content(); //数据绑定datalist
     }
    private void DataList1_content()  //分页
    {
        PagedDataSource ps = new PagedDataSource();//分页实例
        DataTable dt2 = new InnerBLL().SelectAll();
        ps.DataSource = dt2.DefaultView;//绑定分页
        ps.AllowPaging = true; //允许分页
        ps.PageSize = 10;//每页条数
        int maxpage;//总共多少页
        if (ps.Count == 0) return;
        if (ps.DataSourceCount % ps.PageSize > 0)//计算总页数
        {
            maxpage = ps.DataSourceCount / ps.PageSize + 1;//有余数要加1
        }
        else { maxpage = ps.DataSourceCount / ps.PageSize; }
        Session["maxpage"] = maxpage;//保存总页数，在翻页判断时使用
        int curpage;//当前页码
        if (Session["curpage"] == null)
        {
            curpage = 1;//初始化页码
        }
        else { curpage = Convert.ToInt32(Session["curpage"]); }

        Session["curpage"] = ps.CurrentPageIndex + 1;//页码

        lblpage.Text = "第" + Session["curpage"].ToString() + "页（共" + Session["maxpage"].ToString() + "页）";//lable标签

        DataList1.DataSource = ps;
        DataList1.DataBind();
    }
    public void PagerButtonClick(object sender, EventArgs e)  //LinkButton组
    {
            case "next":  
                    if (curpage < Convert.ToInt32(Session["maxpage"]))//未到末页
                    {
                        curpage = curpage + 1;
                    } break;
                case "prev":
                    if (curpage > 1)//未到首页
                    {
                        curpage = curpage - 1;
                    } break;
               case "last":
                    curpage = Convert.ToInt32(Session["maxpage"]); break;
            default: 
            curpage = 1; break;
        }
        Session["curpage"] = curpage;
        DataList1_content();
    }

            <asp:Label ID="lblpage" runat="server" ></asp:Label>
            <asp:LinkButton ID="lb1" runat="server" CommandArgument="fir" >首页</asp:LinkButton>
            <asp:LinkButton ID="lb2" runat="server" CommandArgument="prev">上一页</asp:LinkButton>
            <asp:LinkButton ID="lb3" runat="server" CommandArgument="next">下一页</asp:LinkButton>
            <asp:LinkButton ID="lb4" runat="server" CommandArgument="last">末页</asp:LinkButton>