新闻发布系统（增删改页面）

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="newsLogin.aspx.cs" Inherits="newsLogin" %><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>新闻发布系统</title>
    <link href="Style.css" rel="stylesheet" type="text/css" />
<script language="javascript" type="text/javascript">
// <!CDATA[function P1_onclick() {}// ]]>
</script>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    </div> 
    <p class="style4" style="left: -32px; vertical-align: bottom; position: absolute; top: 13px; text-align: right; width: 95%; behavior: url(newsAdmin.aspx);" id="P1" onclick="return P1_onclick()">   
        <img align="left" src="image/newsCenter_r2_c1.jpg" class="style3"/>
        <a class="nav" href="newsLogin.aspx">新闻管理</a> &nbsp;&nbsp;</p>
        <br />
        <br />
        <br />
        <br />
        <br />
        <asp:GridView ID="GridView1" runat="server" AllowPaging="True" AutoGenerateColumns="False"
            BorderWidth="0px" CellPadding="4" CellSpacing="1" CssClass="Forumline" DataKeyNames="news_id"
            DataSourceID="SqlDataSource1" HorizontalAlign="Center" PageSize="13" Width="95%">
            <PagerSettings FirstPageText="&amp;amp lt;&amp;amplt;第一页" LastPageText="最后一页&amp;ampgt;&amp;ampg;t"
                Mode="NextPreviousFirstLast" NextPageText="下一页&amp;ampgt" PreviousPageText="&amp;amplt;上一页" />
            <RowStyle CssClass="row1" />
            <Columns>
                <asp:BoundField DataField="news_type" HeaderText="类别" SortExpression="news_type">
                    <ItemStyle HorizontalAlign="Center" Width="60px" />
                </asp:BoundField>
                <asp:BoundField DataField="news_date" DataFormatString="{0:d}" HeaderText="日期" HtmlEncode="False"
                    SortExpression="news_date">
                    <ItemStyle HorizontalAlign="Center" Width="80px" />
                </asp:BoundField>
                <asp:HyperLinkField DataNavigateUrlFields="news_id" DataNavigateUrlFormatString="newsDetail.aspx?news_id={0}"
                    DataTextField="news_subject" HeaderText="标题">
                    <ItemStyle HorizontalAlign="Left" />
                </asp:HyperLinkField>
                <asp:BoundField DataField="news_editor" HeaderText="编辑者" SortExpression="news_editor">
                    <ItemStyle HorizontalAlign="Center" Width="80px" />
                </asp:BoundField>
            </Columns>
            <PagerStyle CssClass="nav" />
            <AlternatingRowStyle CssClass="row2" />
        </asp:GridView>
        <br />
        &nbsp;<br />
        <br />
        <br />
        <br />
        <br />
        <br />
        <br />
        <br />
        <br />
        <br />
        <br />
        <br />
        <br />
        <br />
        <br />
        <br />
        <br />
        <br />
        <asp:SqlDataSource ID="SqlDataSource1" runat="server" ConnectionString="<%$ ConnectionStrings:ConnectionString %>" SelectCommand="SELECT * FROM [news] ORDER BY [news_date] DESC"></asp:SqlDataSource>
    </form>
</body>
</html>=======================================================================================
可以调试成功，不过在按添加、更新按钮时，出现的都是同一个页面，为数据表中第一列的数据。
任何的数据要修改，点进去之后，只出现同一个页面。。
这个是怎么回事！
求大侠帮助！