XDocument.Element returns null when parsing an xml string

Question

I have this xml string:

Answer 1

Here is correct way to get prices:

var xdoc = XDocument.Parse(xmlString);
XNamespace ns = xdoc.Root.GetDefaultNamespace();

var pricres = from o in xdoc.Root.Elements(ns + "offers").Elements(ns + "offer")
              select (int)o.Element(ns + "price");

Keep in mind that your document have default namespace, and a is also namespace.