using System.Xml;
XmlDocument doc = new XmlDocument();
doc.Load(@"C:\Path\To_my\xmlfile.xml");
foreach (XmlNode node in doc.SelectNodes("/RssItem/Rss"))
{
string txtSQLQuery = "insert into rss (Url) values ('" +node.Attributes["Url"].InnerText + "')";
ExecuteQuery(txtSQLQuery);
}
}