Rss feed on a Repeater is giving an error

I am trying to parce the Rss feed on a Repeater (or Gridview) But I am unable to. Keeps "Data at the root level is invalid. Line 1, position 1." error.

XmlDocument rssXmlDoc = new XmlDocument();// Load the RSS file from the RSS URLrssXmlDoc.Load("http://feeds.skynews.com/feeds/rss/home.xml");// Parse the Items in the RSS fileXmlNodeList rssNodes = rssXmlDoc.SelectNodes("rss/channel/item");StringBuilder rssContent = new StringBuilder();// Iterate through the items in the RSS fileforeach (XmlNode rssNode in rssNodes){    XmlNode rssSubNode = rssNode.SelectSingleNode("title");    string title = rssSubNode != null ? rssSubNode.InnerText : "";    rssSubNode = rssNode.SelectSingleNode("link");    string link = rssSubNode != null ? rssSubNode.InnerText : "";    rssSubNode = rssNode.SelectSingleNode("description");    string description = rssSubNode != null ? rssSubNode.InnerText : "";    // rssContent.Append("<a href='"+ link +"'>"+ title +"</a><br>"+ description);    rssContent.Append(description);}// Return the string that contain the RSS itemsDataSet ds = new DataSet();XmlTextReader reader = new XmlTextReader(new StringReader(rssContent.ToString()));ds.ReadXml(reader);rssRepeater.DataSource = ds.Tables[2];rssRepeater.DataBind();