[C# net4] Insert in DB the values of xslt file

I need insert in DB the values of xslt file and I tried this code.

The insert in DB is executed but for only first row of xsl file.

I would greatly appreciate any help you can give me in working this problem, thank you.

code behind file:

XmlTextReader reader = new XmlTextReader(stream);
reader.XmlResolver = null;

XmlDocument doc = new XmlDocument();
doc.Load(reader);

xmlRSS.XPathNavigator = doc.CreateNavigator();

XmlNodeList dataNodes = doc.SelectNodes("rss");

OdbcCommand command;
OdbcDataAdapter adpter = new OdbcDataAdapter();

foreach (XmlNode node in dataNodes)
{
string title = node.SelectSingleNode("//title").InnerText;
string description = node.SelectSingleNode("//description").InnerText;
string pubDate = node.SelectSingleNode("//pubDate").InnerText;
string sql = "insert into Product (title, description, pubdate) values ('" + title.ToString() + "', '" + description.ToString() + "', STR_TO_DATE('" + pubDate.ToString() + "', '%a, %d %b %Y %H:%i:%s GMT'));";

connection.Open();
command = new OdbcCommand(sql, connection);
adpter.InsertCommand = command;
adpter.InsertCommand.ExecuteNonQuery();
connection.Close();
}
xslt file