Microsoft.Xml.XQuery math expression error

I'm newer in Microsoft.Xml.XQuery, when I'm trying to run a xquery with math expression like sum i have the error : Cannot apply Add to non integer data.


<book category="COOKING">
  <title lang="en">Everyday Italian</title>
  <author>Giada De Laurentiis</author>


for $item in document("xqt")/bookstore/book[price < '30']
return $item/year/text()  +  $item/year/text() 


  XmlDocument doc1 = new XmlDocument();
        XQueryNavigatorCollection navCol = new XQueryNavigatorCollection();
        navCol.AddNavigator(doc1.CreateNavigator(), "xqt");

        XQueryExpression expr = new XQueryExpression(rteXQuery.Text.Trim().Replace("\\n", " "));

        XQueryNavigator nav = expr.Execute(navCol);

        rteOutput.Text = nav.ToXml();

Any ideas?


for $item in document("xqt")/bookstore/book[price < '30']
return sum($item/year/text(), $item/price/text()) 

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