请哪位高手帮我分析一下下列代码，谢谢
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Intro.aspx.cs" Inherits="Com.BanDaoClub.Web.Intro" %><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "[url=http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd]http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd[/url]">
<html xmlns="[url=http://www.w3.org/1999/xhtml]http://www.w3.org/1999/xhtml[/url]" >
<head runat="server">
<title>无标题页</title>
</head>
<body>
<form id="form1" runat="server">
<asp:PlaceHolder ID="phMainContent" runat="server" EnableViewState="False">
</asp:PlaceHolder>
</form>
</body>
</html>
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