读取Xml文档里的所有内容

这是Xml文件（这个文件我用TXt和Xml两种都试了都是一样的结果）

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
  <appSettings>
    <ConnectionString>Data Source=yf; user id=ctm_dbo;password=123</ConnectionString>
  </appSettings>
</configuration>
----------------------------------------------

代码

 string strXml = File.ReadAllText(Server.MapPath("~\\Xml\\Messages.txt")).ToString();
        ClientScriptManager csm = this.ClientScript;
        csm.RegisterStartupScript(this.GetType(), "sufei",strXml);

------------------------------------

输出的结果是

Data Source=yf; user id=ctm_dbo;password=123
但是大家打开html的源代码看一下就明白了，快捷键是Alt+V+C

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
  <appSettings>
    <ConnectionString>Data Source=yf; user id=ctm_dbo;password=123</ConnectionString>
  </appSettings>
</configuration>