WPF - Searching an XML doc for values using XMLTextReader

GetWeatherFeed("97229", "//weather//loc//dnam", "//weather//cc//tmp", "/weather/cc/icon");

System.Xml.XmlTextReader xtr = new System.Xml.XmlTextReader(Url that retuns xm);
        System.Collections.Hashtable ht = new System.Collections.Hashtable();

        ht = FindTagsUsingXPthNaviatorAndXPathDocumentNew(xtr, location, temperature, iconid);
        lblLocation.Content = ht["Location"].ToString();
        lblWeatherCondition.Content = ht["Weather"].ToString();


public System.Collections.Hashtable FindTagsUsingXPthNaviatorAndXPathDocumentNew(System.Xml.XmlTextReader xtr, string nodeToLocate1, string nodeToLocate2, string nodeToLocate3)
{
    System.Xml.XPath.XPathDocument xpDoc = new System.Xml.XPath.XPathDocument(xtr);
    System.Xml.XPath.XPathNavigator xpNav = xpDoc.CreateNavigator();
    System.Xml.XPath.XPathExpression xpExpression = xpNav.Compile(nodeToLocate1);

    System.Xml.XPath.XPathNodeIterator xpIter = xpNav.Select(xpExpression);
    System.Collections.Hashtable ht = new System.Collections.Hashtable();

    while (xpIter.MoveNext())
    {
        ht.Add("Location", xpIter.Current.Value);
    }

    xpExpression = xpNav.Compile(nodeToLocate2);

    xpIter = xpNav.Select(xpExpression);
    while (xpIter.MoveNext())
    {
        ht.Add("Weather", xpIter.Current.Value);
    }

    xpExpression = xpNav.Compile(nodeToLocate3);

    xpIter = xpNav.Select(xpExpression);
    while (xpIter.MoveNext())
    {
        ht.Add("Icon", xpIter.Current.Value);
    }

    return ht;
}

System.Xml.XmlTextReader xtr = new System.Xml.XmlTextReader(my xml url);
            System.Xml.XPath.XPathDocument xdoc = new System.Xml.XPath.XPathDocument(xtr);

            lblLocation.Content = getXmlNodeValue(xdoc, location);
            lblWeatherCondition.Content = getXmlNodeValue(xdoc, temperature);