我对我的 aspx 页面进行了一些更改，现在它被呈现为空白。实际上它确实显示了包含其他所有内容的 div 标签。其他一切都是看不见的。有人可以指出导致问题的原因吗？继承人的HTML：
<%@ Page StylesheetTheme="" Title="" Language="C#" MasterPageFile="~/Site.Master"
AutoEventWireup="true" CodeBehind="frmMyAccountMyProfile.aspx.cs" Inherits="WebApplication1.frmMyAccountMyProfile" %>
<%@ Register Assembly="AjaxControlToolkit" Namespace="AjaxControlToolkit" TagPrefix="asp" %>
<asp:Content ID="Content1" ContentPlaceHolderID="HeadContent" runat="server">
<script type="text/javascript">
function CheckType(type) {
document.getElementById("hdnfld").value = type;
alert(document.getElementById("hdnfld").value);
return false;
}
function confirmAction() {
if (confirm('Are you sure, you want to delete?')) {
// allow the form to post the data.
return true;
}
else {
// disallow the form submission.
return false;
}
}
</script>
<link href="Styles/myStyleSheet.css" rel="stylesheet" type="text/css" />
</asp:Content>
<asp:Content ID="Content2" ContentPlaceHolderID="MainContent" runat="server">
<form action="">
<div class="divwrap">
<table style="width: 100%; margin-right: 0px;">
<tr>
<td>
</td>
<td>
</td>
<td>
</td>
</tr>
<tr>
<td>
</td>
<td>
<asp:TabContainer ID="TabContainer1" runat="server" CssClass="ajax__tab_lightblue-theme"
ActiveTabIndex="1">
<asp:TabPanel runat="server" HeaderText="My Profile" ID="tbpnlMyProfile">
<HeaderTemplate>
My Profile
</HeaderTemplate>
<ContentTemplate>
<table style="width: 100%;">
<tr>
<td class="colwid colht">
<asp:LinkButton ID="lnkBtnEditMyInfo" class="small-heading" runat="server" OnClick="lnkBtnEditMyInfo_Click">Edit My Info</asp:LinkButton>
</td>
<td>
<asp:Label ID="lblFirstNameMyProfile" runat="server" Text="First Name"></asp:Label>
</td>
<td rowspan="3">
<asp:Panel ID="pnlDisplay" runat="server">
<table style="width: 100%;">
<tr>
<td class="colht">
<asp:Label ID="lblMPDisplayFirstName" runat="server" Text="Label"></asp:Label>
<br />
</td>
</tr>
<tr>
<td class="colht">
<asp:Label ID="lblMPDisplayLastName" runat="server" Text="Label"></asp:Label>
<br />
</td>
</tr>
<tr>
<td class="colht">
<asp:Label ID="lblMPDisplayEmail" runat="server" Text="Label"></asp:Label>
<br />
</td>
</tr>
</table>
</asp:Panel>
<asp:Panel ID="pnlEditInfo" runat="server" Visible="False">
<table style="width: 100%;">
<tr>
<td class="colht">
<asp:TextBox ID="txtEditFirstName" runat="server"></asp:TextBox>
</td>
</tr>
<tr>
<td class="colht">
<asp:TextBox ID="txtEditLastName" runat="server"></asp:TextBox>
</td>
</tr>
<tr>
<td class="colht">
<asp:TextBox ID="txtEditEmail" runat="server"></asp:TextBox>
</td>
</tr>
<tr>
<td class="colht">
<asp:Button ID="btnEditInfoCancel" runat="server" CssClass="btndel" OnClick="btnEditInfoCancel_Click"
Text="Cancel" />
<asp:Button ID="btnEditInfoSave" runat="server" CssClass="btn" OnClick="btnEditInfoSave_Click"
Text="Save" />
</td>
</tr>
</table>
</asp:Panel>
</td>
<tr>
<td class="colht">
</td>
<td class="">
<asp:Label ID="lblLastNameMyProfile" runat="server" Text="Last Name"></asp:Label>
</td>
</tr>
<tr>
<td>
</td>
<td class="colht">
<asp:Label ID="lblEmailMyProfile" runat="server" Text="Email"></asp:Label>
</td>
<tr>
<td>
<br />
</td>
<td>
</td>
<td>
</td>
</tr>
<tr>
<td>
<asp:LinkButton ID="lnkbtnChangePassword" runat="server" class="small-heading">ChangePassword</asp:LinkButton>
</strong>
</td>
<td>
<asp:LinkButton ID="lnkChangePassword" runat="server" OnClick="lnkChangePassword_Click">Click here to change your password</asp:LinkButton>
<br />
<asp:Panel ID="pnlChangePassword" runat="server" CausesValidation="False" Visible="False">
<table style="width: 100%;">
<tr>
<td class="">
</td>
<td style="width: 150px">
<asp:Label ID="lblOldPassword" runat="server" CssClass="lbl2" Text="Old Password"></asp:Label>
</td>
<td class="">
<asp:TextBox ID="txtOldPassword" runat="server" CssClass="txtbx2" TextMode="Password"></asp:TextBox>
</td>
<td class="">
<asp:RequiredFieldValidator ID="RequiredFieldValidator1" runat="server" ControlToValidate="txtOldPassword"
ErrorMessage="Please enter password!"></asp:RequiredFieldValidator>
</td>
</tr>
<tr>
<td class="">
</td>
<td class="">
<asp:Label ID="lblNewPassword" runat="server" CssClass="lbl2" Text="New Password"></asp:Label>
</td>
<td class="">
<asp:TextBox ID="txtNewPassword" runat="server" CssClass="txtbx2" TextMode="Password"></asp:TextBox>
</td>
<td class="">
<asp:RequiredFieldValidator ID="RequiredFieldValidator2" runat="server" ControlToValidate="txtNewPassword"
ErrorMessage="Please choose new password!"></asp:RequiredFieldValidator>
</td>
</tr>
<tr>
<td>
</td>
<td class="">
<asp:Label ID="lblConfirmPassword" runat="server" CssClass="lbl2" Text="ConfirmPassword"></asp:Label>
</td>
<td>
<asp:TextBox ID="txtConfirmPassword" runat="server" CssClass="txtbx2" TextMode="Password"></asp:TextBox>
</td>
<td>
<asp:CompareValidator ID="CompareValidator1" runat="server" ControlToCompare="txtNewPassword"
ControlToValidate="txtConfirmPassword" ErrorMessage="CompareValidator"></asp:CompareValidator>
</td>
</tr>
<tr>
<td>
</td>
<td class="">
<asp:Button ID="btnCancel1" runat="server" CausesValidation="False" CssClass="btndel"
OnClick="btnCancel1_Click1" Text="Cancel" Width="60px" />
</td>
<td>
<asp:Button ID="btnSaveNewPassword" runat="server" CssClass="btn" OnClick="btnSaveNewPassword_Click"
Text="Save" />
</td>
<td>
</td>
</tr>
<tr>
<td>
</td>
<td class="">
</td>
<td>
</td>
<td>
</td>
</tr>
</table>
</asp:Panel>
</td>
<td>
</td>
</tr>
<br />
<br />
<tr>
<td>
</td>
<td colspan="2">
<br />
</td>
</tr>
<tr>
<td>
<asp:LinkButton ID="lnkbtnEditContactNo" runat="server" class="small-heading"
OnClick="lnkbtnEditContactNo_Click">Edit Contact No.</asp:LinkButton>
</td>
<td colspan="2">
<asp:Label ID="lblDisplayContactNo" runat="server" Text="Label"></asp:Label>
<asp:Panel ID="pnlEditContactNo" runat="server" Visible="False">
<asp:DropDownList ID="ddlEditCountryNameCode" runat="server" CssClass="ddl2" OnSelectedIndexChanged="ddlEditCountryNameCode_SelectedIndexChanged">
</asp:DropDownList>
<asp:TextBox ID="txtEditMobile" runat="server" CssClass="txtbx2"></asp:TextBox>
<br />
<asp:Button ID="btnCancel" runat="server" CssClass="btndel" OnClick="btnCancel_Click"
Text="Cancel" />
<asp:Button ID="btnSave" runat="server" CssClass="btn" OnClick="btnSave_Click"
Text="Save" />
</asp:Panel>
</td>
</tr>
</tr>
</tr>
</table>
</ContentTemplate>
</asp:TabPanel>
<asp:TabPanel ID="tbpnlAddressbook" runat="server" HeaderText="Addressbook">
<HeaderTemplate>
Addressbook
</HeaderTemplate>
<ContentTemplate>
<table style="width: 100%;">
<tr>
<td>
</td>
<td>
</td>
<td>
</td>
</tr>
<tr>
<td>
<asp:LinkButton ID="lnkbtnViewChange" runat="server" class="small-heading">View / Change</asp:LinkButton>
</td>
<td>
<asp:DropDownList ID="ddlName" runat="server" AutoPostBack="True" CssClass="ddl2"
OnSelectedIndexChanged="ddlName_SelectedIndexChanged">
</asp:DropDownList>
</td>
</tr>
<tr>
<td>
</td>
<td>
<div>
<asp:Label ID="lblDisplayFirstName" runat="server" Text="Label"></asp:Label>
<asp:Label ID="lblDisplayLastName" runat="server" Text="Label"></asp:Label>
<br />
<asp:Label ID="lblDisplayAddressLine1" runat="server" Text="Label"></asp:Label>
<br />
<asp:Label ID="lblDisplayAddressLine2" runat="server" Text="Label"></asp:Label>
<asp:Label ID="lblDisplayAddressLine3" runat="server" Text="Label"></asp:Label>
<asp:Label ID="lblDisplayCity" runat="server" Text="Label"></asp:Label>
<br />
<asp:Label ID="lblDisplayState" runat="server" Text="Label"></asp:Label>
<br />
<asp:Label ID="lblDisplayCountry" runat="server" Text="Label"></asp:Label>
<br />
<asp:Label ID="lblDisplayPostalCode" runat="server" Text="Label"></asp:Label>
<br />
<asp:Button ID="btnEdit" runat="server" CssClass="roundcorner btn" OnClick="btnEdit_Click"
OnClientClick="return CheckType('Edit');" Text="Edit"
CausesValidation="False" />
<asp:ModalPopupExtender ID="btnEdit_ModalPopupExtender" runat="server"
DynamicServicePath="" Enabled="True" TargetControlID="btnDummy" PopupControlID="pnlMyAddressBook" BackgroundCssClass="modalBackground roundcorner">
</asp:ModalPopupExtender>
<asp:Button ID="btnDelete" runat="server" CssClass="btndel" OnClick="btnDelete_Click1"
OnClientClick="javascript: return confirmAction()" Text="Delete" />
<asp:Button ID="btnDummy" runat="server" Text="Dummy" Visible="False" /></div>
</td>
</tr>
<tr>
<td>
</td>
<td>
<asp:LinkButton ID="lnkbtnAddNewAddress" runat="server"
CausesValidation="False" onclick="lnkbtnAddNewAddress_Click1">AddNewAddress</asp:LinkButton>
<asp:ModalPopupExtender ID="lnkbtnAddNewAddress_ModalPopupExtender"
runat="server" DynamicServicePath="" Enabled="True"
TargetControlID="lnkbtnAddNewAddress" PopupControlID="btnDummy" BackgroundCssClass="modalBackground roundcorner">
</asp:ModalPopupExtender>
</td>
</tr>
</table>
<div class="divwrap">
<asp:Panel ID="pnlMyAddressBook" runat="server" BackColor="White"
CssClass="roundcorner" Visible="False">
</asp:Panel>
</div>
<asp:RoundedCornersExtender ID="pnlMyAddressBook_RoundedCornersExtender" runat="server"
Enabled="True" TargetControlID="pnlMyAddressBook">
</asp:RoundedCornersExtender>
</table>
</ContentTemplate>
</asp:TabPanel>
</asp:TabContainer>
<asp:ToolkitScriptManager ID="ToolkitScriptManager1" runat="server">
</asp:ToolkitScriptManager>
</td>
<td>
</td>
</tr>
</table>
<asp:HiddenField ID="hdnfld" runat="server" />
</div>
</form>
</asp:Content>
.divwrap
{
padding: 3%;
display: inline-block;
margin: 3%;
border: 1px solid #66CCFF;
vertical-align: middle;
width: auto;
position: relative;
}