using System;

using System.Web;

​

using System.Xml.Serialization;

using System.Reflection;

using System.Xml;

using System.IO;

using System.Linq;

using System.Net;

using System.Text;

using System.Text.RegularExpressions;

public class Program

{

    public static void Main()

    {

        string myString="<devicedata>{&quot;correlation_id&quot;:&quot;9944d07105960c097dfa055a73b91572&quot;}</devicedata>";

        //string myString="<devicedata>{\"correlation_id\":\"51c3aa25abfedf409cf3923cd73decc7\"}</devicedata>";

        //string myString="{"+"\""+"correlation_id"+"\""+":"+"\""+"2605e4ac18ecfad2d122783f2a6e1a7e"+"\""+"}";

         byte[] objReq;

             var serializer = new XmlSerializer(myString.GetType());

        //Console.WriteLine(myString);

        using (var memStm = new MemoryStream())

             using (var xw = XmlWriter.Create(memStm))

                {

                    serializer.Serialize(xw, myString);

                    objReq = memStm.ToArray();

                }

        byte[] bytes = Encoding.Default.GetBytes(myString);

        //myString = Encoding.UTF8.GetString(objReq);

        myString = Encoding.UTF8.GetString(objReq);

    //  myString = Encoding.ASCII.GetString(objReq);

        Console.WriteLine(myString);

    }

}