[STAThread]
 static void Main(string[] args) {...}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using www.utilities_online.info;

namespace ConsoleApplication4
{
    class Program
    {
        [STAThread]
        static void Main(string[] args)
        {
            var xml = "<person><name>Mike</name><age>30</age></person>";
            var json = new XmlJsonConverter().Xml2Json(xml);
            Console.Write(json.Replace("\r", ""));
        }
    }
}