Hi, I wrote a tiny function thath should return me the id of a prevalue from a string input. This is the code:

    protected String GetSectionByName(string name)
    {
        String retValue = string.Empty;
        if (!String.IsNullOrEmpty(name))
        {
            XPathNodeIterator iterator = umbraco.library.GetPreValues(1617); 
            iterator.MoveNext(); //move to first
            XPathNodeIterator preValues = iterator.Current.SelectChildren("preValue", "");
            System.Xml.XPath.XPathNavigator navProductID = preValues.Current.SelectSingleNode(name);
            if(navProductID != null)
                retValue = navProductID.GetAttribute("id","");
            else
                retValue = "NULL";
        }
        return retValue;
    }

Basically the function still returns empty as the navProductId is always null. I cannot get a single node id by value. Any hints?