using Newtonsoft.Json;

using System;

using System.IO;

using System.Text;

using System.Xml;

public class Program

{

    public static void Main()

    {

        const string xmlData = "<a> <b>H\x82ello</b> <c>W\x83orld</c> </a>";

​

        using var xmlStream = new MemoryStream(Encoding.UTF8.GetBytes(xmlData));

​

        var xml = new XmlDocument();

        xml.Load(xmlStream);

​

        var json = JsonConvert.SerializeXmlNode(xml);

​

        Console.WriteLine(json);

    }

}