Solving the problem of colon-reading in XML _c# tutorial

Reference article: http://chs.gotdotnet.com/quickstart/howto/doc/Xml/XmlNameSpace.aspx

I Source:
public void Bindxml (string xmlUrl)
{
System.Xml.XmlDocument doc = new System.Xml.XmlDocument ();
Doc. Load (system.appdomain.currentdomain.basedirectory+ "Kkjj.xml");
Doc. Load (XMLURL);
Doc. SelectNodes ("/rss/channel");
System.Xml.XmlNode root = Doc. DocumentElement;
System.Xml.XmlNode xn = root. selectSingleNode ("/rss/channel");
Outstr + = "Album name:" + xn. selectSingleNode ("title"). innertext;//Album name
Outstr + = "<br> album URL:" + xn. selectSingleNode ("link"). innertext;//album URL
Outstr + + <br> photo Album:
Outstr + = "<br>System.Xml.XmlNodeList xnl = xn. SelectNodes ("item");
Outstr + + <br> photo albums: + XNL. Count.tostring () + "Zhang";

System.Xml.XmlNamespaceManager Nsmanager = new System.Xml.XmlNamespaceManager (Doc. NameTable);
Nsmanager. AddNamespace ("Media", "http://search.yahoo.com/mrss/");

Creates a string containing an XPATH expression for evaluation.
String exprstring = String.Format ("//{0}:group", "media");

System.Xml.XmlNodeList nodelist = doc. SelectNodes (exprstring, Nsmanager);

Outstr + = "<br>media:title:" +nodelist[0]. selectSingleNode ("Media:title", Nsmanager). attributes["type"]. InnerText;





for (int i=0;i<xnl. count;i++)
//            {
Outstr + = "<br> //            }
}

I saw it at the time. GG's XML has a colon, the card is solved.
To pay the XML fragment

-<media:group>
<media:title type= "plain" >02.JPG</media:title>
<media:description type= "plain"/>
<media:keywords/>
"Yun_qi_img/02.jpg" height= "<media:thumbnail" width= "url="/>
<media:thumbnail url= "yun_qi_img/02.jpg" height= "width=" 144
<media:thumbnail url= "yun_qi_img/02.jpg" height= "the" width= "" "/>
<media:content url= "yun_qi_img/02.jpg" height= "width=" type= "image/jpeg" medium= "image"/>
<media:credit> Powertrain </media:credit>
</media:group>

XML Address: Http://picasaweb.google.com/pengpengsay/lNFxFK