How to remove all namespaces from XML with C#?

Question

I am looking for the clean, elegant and smart solution to remove namespacees from all XML elements? How would function to do that look like?

Defined interface:

Answer 1

Slightly modified Peter's answer, this would works fine for the attribute as well, including remove the namespace and prefix. A bit sorry for the code looks a bit ugly.

 private static XElement RemoveAllNamespaces(XElement xmlDocument)
        {
            if (!xmlDocument.HasElements)
            {
                XElement xElement = new XElement(xmlDocument.Name.LocalName);
                xElement.Value = xmlDocument.Value;

                foreach (XAttribute attribute in xmlDocument.Attributes())
                {
                    xElement.Add(new XAttribute(attribute.Name.LocalName, attribute.Value));
                }

                return xElement;
            }

            else
            {
                XElement xElement = new XElement(xmlDocument.Name.LocalName,  xmlDocument.Elements().Select(el => RemoveAllNamespaces(el)));

                foreach (XAttribute attribute in xmlDocument.Attributes())
                {
                    xElement.Add(new XAttribute(attribute.Name.LocalName, attribute.Value));
                }

                return xElement;
            }

    }