How to remove XML namespaces

gistfile1.cs

using System.Linq;
using System.Xml.Linq;

namespace Foo.Namespace
{
    public class XmlUtils
    {
        public static string RemoveAllNamespaces(string xmlDocument)
        {
            XElement xmlDocumentWithoutNs = RemoveAllNamespaces(XElement.Parse(xmlDocument));

            return xmlDocumentWithoutNs.ToString();
        }

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

            return new XElement(xmlDocument.Name.LocalName, xmlDocument.Elements().Select(el => RemoveAllNamespaces(el)));
        }

        public static string ReplaceSpecialCharacters(string serializedXml)
        {
            return serializedXml.Replace("&lt;", "<").Replace("&quot;", "\"").Replace("&gt;", ">");
        }
    }
}