嵌套的Iframe页面地址，后台无法执行Page_Load事件


      <div id="Layer">
<h3>输入查询码</h3>
<div class="closeMap" onclick="javascript:closeMap(0);">
<img src="images/close.png" alt="关闭窗口" />
                </div>
<div class="dArea">
<iframe id="iframe1" name="iframe1" style="height:100%;width:100%;" 
src="SeekCode.aspx?guid=11111111" scrolling="no" frameborder="0">                                              </iframe>
</div>
      </div>
      <div id="BgLayer" style="position:absolute; display: none;"></div>SeekCode.aspx 页面代码<%@ Page Language="C#" AutoEventWireup="false" CodeBehind="SeekCode.aspx.cs" Inherits="JNCallCenter.SeekCode" %><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" ><html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
    <link href="css/article.css" rel="stylesheet" type="text/css" />
    <script src="supprot/view.js" type="text/javascript"></script>
</head>
<body>
    <form id="form1" runat="server">
       <div style="width:100%;height:100%; font-size:12px;" align="center">
           <div>想要查看此问题答复情况，请输入查询码：</div>
           <br />
           <div valign="middle">
             查询码：<input class="tbox_edit" type="text" id="strSeekCode" name="strSeekCode" maxlength="10" runat="server"/>
           </div>
           <br />
           <div>
               <span id="span_SeekCodeMsg" style="display: none;"></span>
            </div>
           <br />
           <div>
              <input type="button" id="Qurey" name="Qurey" value="提交" onclick="return QuerySeekCode();"/>
              <input type="hidden" id="guid" name="guid" runat="server"/>
           </div>
       </div>
    </form>
</body>
</html>我调试时发现SeekCode.aspx.cs 页面，不执行Page_Load事件 这是什么情况？