c# Reading xml with namespace problem [closed]

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I want to read the value in rss/channel/itunes:subtitle

xml: see http://podcast.q-dance.nl/audio/qdance/q-dancepodcast.xml

I tried:

System.Xml.XmlDocument pd = new System.Xml.XmlDocument();
pd.Load(podcasterUrl);
XmlElement resultt = pd.DocumentElement;
XmlNamespaceManager mgr = new XmlNamespaceManager(pd.NameTable);
mgr.AddNamespace("itunes", "http://www.itunes开发者_StackOverflow.com/dtds/podcast-1.0.dtd");
XmlNode nodeS = resultt.SelectSingleNode("/rss/channel/itunes:subtitle", mgr);
string subtitle = nodeS.InnerText.ToString();

subtitle is now:

This is the official ...

but in XML it is

Representing the ...

Can someone help me?