using System;

using System.Xml.Linq;

using Newtonsoft.Json;

​

public class Program

{

    public static void Main(String[] args)

    {

        var jsonEncodedXml =

            "<?xml version=\\\"1.0\\\" encoding=\\\"utf-8\\\"?>\\n<ProfileInformation>\\n\\t<Username>bgs264</Username>\\n</ProfileInformation>";

​

        var jsonEncodedXmlInQuotes = string.Format("\"{0}\"", jsonEncodedXml);

​

        var xmlString = JsonConvert.DeserializeObject<string>(jsonEncodedXmlInQuotes);

​

        var doc = XDocument.Parse(xmlString);

​

        Console.WriteLine(doc);

    }

}

​