example.cs

using System;
using ExpressMapper;

namespace ConsoleApplication1
{
    public class Boo
    {
        public string x;
    }

    public class BooModel
    {
        public string x;
    }
    class Program
    {
        static void Main(string[] args)
        {
            Mapper.Register<Boo, BooModel>();
            
            var x = new Boo{x="hello world"};
            BooModel model = x.MapTo<Boo, BooModel>();
           
            Console.WriteLine(model.x);
        }
    }
}

Dear Igor,

Thanks for your valuable input!
The thing is that I couldn't able reproduce this bug. Could you please install new version of Expressmapper 1.5 - it is available right now.
Let me know if it doesn't solve your issue.

Thanks,
Yuriy