行 1: <%@ Page Language="C#" MasterPageFile="~/MasterPage.master" AutoEventWireup="true" CodeFile="Error.aspx.cs" Inherits="Error" Title="Untitled Page" %>
行 2: <asp:Content ID="Content1" ContentPlaceHolderID="ContentPlaceHolderMain" Runat="Server">
行 3: <asp:Panel ID="panel_404" runat="server" Visible="false">
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