XML怎么获取指定节点下所有子节点的值

XML如何获取指定节点下所有子节点的值
page的id属性表示第几页，然后我想输出指定页的所有子节点的值，比如我要输出id=3的那个节点下所有子节点的值，应该怎么做啊？
我是从外面传了个page值进来，然后就不知道怎么搞了

JScript code

function sendRequest(page){    createXHR();    var url='xml/pic.xml?id='+page;    xmlHttp.open('GET',url,true);    xmlHttp.onreadystatechange=function(){thumbList(page);};    xmlHttp.send(null);  }function thumbList(page){      if (xmlHttp.readyState==4){          if (xmlHttp.status == 200){              var xml=xmlHttp.responseXML;              //var xml_page=xml.getElementsByTagName('page')['page'];              }          }      }

XML code

<?xml version="1.0" encoding="utf-8"?><picstore>  <page id="1">    <pic>      <name></name>      <desc></desc>      <path></path>      <thumb>../product-img/2step14tracks.png</thumb>    </pic>    <pic>      <name></name>      <desc></desc>      <path></path>      <thumb>../product-img/14_tracks_R_Henke.png</thumb>    </pic>      </page>    <page id="2">    <pic>      <name></name>      <desc></desc>      <path></path>      <thumb>../product-img/bristol_badge.png</thumb>    </pic>    <pic>      <name></name>      <desc></desc>      <path></path>      <thumb>../product-img/cache_2.png</thumb>    </pic>    <pic>      <name></name>      <desc></desc>      <path></path>      <thumb>../product-img/Casiomt40_2.png</thumb>    </pic>        <page id="3">    <pic>      <name></name>      <desc></desc>      <path></path>      <thumb>../product-img/DigitalHardcore.png</thumb>    </pic>    <pic>      <name></name>      <desc></desc>      <path></path>      <thumb>../product-img/disco01.png</thumb>    </pic>       。。。。。。。。。。。。。。。。。。。        </picstore>

[解决办法]
XElement root = XElement.Load(@"xml/pic.xml");

var pages = from page in root.Descendants("page")

where page.Attribute("page").Value == "3"

select (string)page;

foreach (string page in pages)
{......}

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