寻呼代码问题

我在下面写了几行代码，用于在asp.net中使用中继器控制作为实现分页

  <asp:LinkButton ID="LinkButton1" runat="server" CausesValidation="false" OnClick="pagenexte_Click"
    data-rel="tooltip" data-original-title="previous page.">&laquo;</asp:LinkButton>
<asp:Repeater ID="rptPager" OnItemDataBound="rptPager_ItemDataBound" runat="server">
    <ItemTemplate>
        <asp:LinkButton ID="lnkPage" runat="server" Text='<%#Eval("Text") %>' CommandArgument='<%# Eval("Value") %>' Enabled='<%# Eval("Enabled") %>' OnClick="Page_Changed"></asp:LinkButton>
    </ItemTemplate>
</asp:Repeater>
<asp:LinkButton ID="LinkButton3" runat="server" CausesValidation="false" OnClick="pagenext_Click" 
       data-rel="tooltip" data-original-title="next page.">&raquo;
</asp:LinkButton>
<asp:LinkButton ID="LinkButton2" runat="server" CausesValidation="false" OnClick="imgnext_Click"
    data-rel="tooltip" data-original-title="next page." Visible="false">    &raquo;
</asp:LinkButton>

在cs文件中作为

    public void UpdatePageLables(int aPageCount)
{
    if (!Page.IsPostBack)
    {
        Session["pages"] = null;
    }
    PageCount = (int)Math.Ceiling((decimal)aPageCount / PageSize);
    int recordCount = PageCount;
    if (PageSizeChanged != null)
    {
        HiddenField hd = new HiddenField();
        int current;
        current = PageIndex;
        int pre;
        int Next;
        double dblPageCount = (double)((decimal)recordCount / decimal.Parse(lstPageSize.SelectedValue));
        int pageCount = PageCount;
        List<ListItem> pages = new List<ListItem>();
        if (pageCount > 0)
        {
            // pages.Add(new ListItem("First", "1", PageIndex > 1));
            current = PageIndex;
            pre = --PageIndex;
            PageIndex = current;
            // pages.Add(new ListItem("Previous", pre.ToString(), PageIndex > 1));
            for (int i = 1; i <= aPageCount; i++)
            {
                if (i <= 5)
                {
                    pages.Add(new ListItem(i.ToString(), i.ToString(), i != PageIndex));
                }
            }

            int currentPage = PageIndex;
            Next = ++PageIndex;
            PageIndex = currentPage;
            //pages.Add(new ListItem("Next", Next.ToString(), PageIndex < pageCount));
            // pages.Add(new ListItem("Last", pageCount.ToString(), PageIndex < pageCount));
            hd.Value = (pre.ToString());

        }
        if (Session["pages"] != null)
        {
            rptPager.DataSource = Session["pages"];
            rptPager.DataBind();
        }
        else
        {
            rptPager.DataSource = pages;
            rptPager.DataBind();
        }
        Session["lastnumber"] = 5;
        Session["pagecount"] = aPageCount;
        Session["orignalpages"] = pages;
    }
}
protected void pagenext_Click(object sender, EventArgs e)
{
    List<ListItem> pages = new List<ListItem>();
    int pagecount = Convert.ToInt32(Session["pagecount"].ToString());
    int lastnumber = Convert.ToInt32(Session["lastnumber"].ToString());
    if (lastnumber > pagecount)
    {
        Session["lastnumber"] = 1;
        lastnumber = 1;
        Session["pagecount"] = pagecount;
        Session["orignalpages"] = pages;
    }

    int limit = lastnumber + 5;
    for (int i = lastnumber; i <= pagecount; i++)
    {
        if (i <= limit)
        {
            pages.Add(new ListItem(i.ToString(), i.ToString(), i != PageIndex));
        }
        else
        {
            rptPager.DataSource = Session["orignalpages"];
            rptPager.DataBind();
        }
    }

    Session["lastnumber"] = limit;
    Session["pagecount"] = pagecount;
    Session["pages"] = pages;
    rptPager.DataSource = pages;
    rptPager.DataBind();
}
protected void pagenexte_Click(object sender, EventArgs e)
{
    List<ListItem> pages = new List<ListItem>();
    int pagecount = Convert.ToInt32(Session["pagecount"].ToString());
    int lastnumber = Convert.ToInt32(Session["lastnumber"].ToString());
    if (lastnumber > pagecount)
    {
        Session["lastnumber"] = pagecount - 5;
        lastnumber = pagecount - 5;
        Session["pagecount"] = pagecount;
        Session["orignalpages"] = pages;
    }
    else
    {
        Session["lastnumber"] = 1;
        lastnumber = 1;
        Session["pagecount"] = pagecount;
        Session["orignalpages"] = pages;
    }
    int limit = lastnumber + 5;
    for (int i = lastnumber; i <= pagecount; i++)
    {
        if (i <= limit && i>0) 
        {
            pages.Add(new ListItem(i.ToString(), i.ToString(), i != PageIndex));
        }
        else
        {
            //rptPager.DataSource = Session["orignalpages"];
            //rptPager.DataBind();
        }
    }

    Session["lastnumber"] = limit;
    Session["pagecount"] = pagecount;
    Session["pages"] = pages;
    rptPager.DataSource = pages;
    rptPager.DataBind();
}

它工作正常，但不按要求显示页码。基本上，我希望它应该显示为"1 2 3 4 5"，然后单击下一个按钮，它应该显示"6 7 8 9 10"，然后再次单击下一按钮"11 12 13 14 15"。。。。依此类推。下面的代码生成页码为"1 2 3 4 5"单击下一个按钮"5 6 7 8 9 10"，然后单击10 11 12 13 14 15等等…请帮帮我！！！还帮助我改进上一个按钮的代码而且