How to remove #cdata-section when convert xml to json using Linq

xml2json.cs

string xml = '<Profile><First_Name><![CDATA[Luke]]</First_Name><Last_Name><![CDATA[Skywalker]]</Last_Name><guid><![CDATA[D521C0A3-B6BB-4EA0-AEC6-07860BFE9313]]></guid></Profile>';
string json = string.Empty;

if (!string.IsNullOrEmpty(response_xml))
{
    var doc = XElement.Parse(response_xml);
    var node_cdata = doc.DescendantNodes().OfType<XCData>().ToList();

    foreach (var node in node_cdata)
    {
        node.Parent.Add(node.Value);
        node.Remove();
    }

    return json = JsonConvert.SerializeXNode(doc, Newtonsoft.Json.Formatting.None, false);                    
}