Change namespace in XML

gistfile1.cs

XNamespace ns = "http://mycompany/myproduct/v2";
foreach (XElement el in document.Root.DescendantsAndSelf())
{
    el.Name = ns.GetName(el.Name.LocalName);
    List<XAttribute> atList = el.Attributes().ToList();
    el.Attributes().Remove();
    foreach (XAttribute at in atList)
    {
        el.Add(new XAttribute(ns.GetName(at.Name.LocalName), at.Value));
    }
}
document.Root.Add(new XAttribute(XNamespace.Xmlns + "ns", ns));