ASP.NET2.0的模版页问题，大家帮帮忙哈~~

一个注册文件，单独能好好的运行，嵌套进模版页以后，该文件提交的时候就不能够获取表单的值了，提示错误“未将对象引用设置到对象的实例”，去掉模版加上<form>则又好好的，能够正常运行，什么问题导致的啊？
大家帮帮忙哈~~~~~ 有谁碰到过这种问题哈~？在线等

解决方案 »

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在模版页中取得控件的ID要通过FindControl
我需要的是在内容页提交后在内容页的.CS文件里获得内容页的表单值。。跟模版页一点关系都没，内容页要是单独存在的时候就能正常运行，如果去掉<form>后嵌进模版页则不能够获取表单的值了。
TextBox CheckN = (TextBox)PreviousPage.Master.FindControl("Content").FindControl("yanzhengma");我这样用了，也不能获取到值啊~~~~
下面是masterpage.master<%@ Master Language="C#" AutoEventWireup="true" CodeFile="MasterPage.master.cs" Inherits="MasterPage" %>
<%@ Register Src="UserControl/TopLogin.ascx" TagName="TopLogin" TagPrefix="uc1" %>
<%@ Register Src="UserControl/top.ascx" TagName="top" TagPrefix="uc2" %>
<%@ Register Src="UserControl/CopyRight.ascx" TagName="CopyRight" TagPrefix="uc3" %><!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>无标题页</title>
    <style type="text/css">
    body{font-family:宋体;color:0000FF}
    img{border:0}
    td,p,div{font-size:12px;align:center}
    .gg{height:25px;color:#666666;align:center;valign:middle}
    a{text-decoration: none;line-height: 18px;}
    a:link{color:#009;}
    a:visited{color:#800080;}
    a:hover,a:active,a:focus{color:#c00;}
    </style>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <uc1:TopLogin ID="TopLogin1" runat="server" />
        <br />
        <uc2:top ID="Top1" runat="server" />
        <asp:contentplaceholder id="Content" runat="server">
        </asp:contentplaceholder>
    </div>
        <uc3:CopyRight ID="CopyRight1" runat="server" />
    </form>
</body>
</html>
这里是zhuce.aspx
<%@ Page Language="C#" autoeventwireup="true" codefile="zhuce.aspx.cs" Inherits="zhuce" MasterPageFile="~/MasterPage.master" Title = "注册用户"%>
<asp:Content runat="server" ContentPlaceHolderID="Content" ID = "zhuce"> <div><br/>
            <table cellspacing="0" cellpadding="0" width="100%" border="0">
                <tbody>
                    <tr>
                        <td></td><td align="left" height="25"><b>会员注册</b></td>
                    </tr>
                    <tr>
                        <td style="WIDTH: 203px; HEIGHT: 24px" align="right">用户名:</td>
                        <td style="HEIGHT: 24px">
                             <asp:TextBox ID="UserName" runat="server" Width="80px"></asp:TextBox>
                            <asp:RequiredFieldValidator id="RequiredFieldValidator1" runat="server" ErrorMessage="用户名不能为空" Display="Dynamic" ControlToValidate="UserName"></asp:RequiredFieldValidator>
                        </td>
                    </tr>
                    <tr>
                        <td style="WIDTH: 203px; HEIGHT: 28px" align="right">密码:</td>
                        <td style="HEIGHT: 28px">
                             <asp:TextBox ID="PassWord" runat="server" TextMode="Password"></asp:TextBox>
                            <asp:RequiredFieldValidator id="RequiredFieldValidator2" runat="server" ErrorMessage="密码不能为空" Display="Dynamic" ControlToValidate="PassWord"></asp:RequiredFieldValidator>
                        </td>
                    </tr>
                    <tr>
                        <td style="WIDTH: 203px; HEIGHT: 19px" align="right">确认:</td>
                        <td style="HEIGHT: 19px">
                             <asp:TextBox ID="PWD" runat="server" TextMode="Password"></asp:TextBox>
                            <asp:CompareValidator id="CompareValidator1" runat="server" ErrorMessage="两次输入的密码不一致" ControlToValidate="PWD" ControlToCompare="PassWord"></asp:CompareValidator>
                        </td>
                    </tr>
                    <tr>
                        <td style="WIDTH: 203px; HEIGHT: 19px" align="right">Email:</td>
                        <td style="HEIGHT: 19px">
                             <asp:TextBox ID="Email" runat="server"></asp:TextBox>
                            <asp:RegularExpressionValidator id="RegularExpressionValidator1" runat="server" ErrorMessage="Email格式错误" Display="Dynamic" ControlToValidate="Email" ValidationExpression="\w+([-+.']\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*"></asp:RegularExpressionValidator>
                        </td>
                    </tr>
                    <tr>
                        <td style="WIDTH: 203px; HEIGHT: 24px" align="right">验证码:</td>
                        <td style="HEIGHT: 24px">
                             <asp:TextBox ID="yanzhengma" runat="server" Width="40px"></asp:TextBox>
                            <asp:Label id="Label1" runat="server"></asp:Label>
                            <asp:RequiredFieldValidator id="RequiredFieldValidator3" runat="server" ErrorMessage="验证码不能为空" Display="Dynamic" ControlToValidate="yanzhengma"></asp:RequiredFieldValidator>
                        </td>
                    </tr>
                    <tr>
                        <td style="WIDTH: 203px; HEIGHT: 24px"></td>
                        <td style="HEIGHT: 24px">
                            <asp:Button id="Button1" runat="server" Text=" 注册 "></asp:Button>
                        </td>
                    </tr>
                </tbody>
            </table>
<br/>
</div>
</asp:Content>
我现在要做的是在 zhuce.aspx.cs 里面获取 zhuce.aspx 里面的值，该怎样做呢？