Automapper nullable property mapping

gistfile1.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using AutoMapper;

namespace ConsoleApplication14
{
    class Program
    {

        class Source
        {
            public int? A { get; set; }
        }

        class Target
        {
            public int? A { get; set; } 
        }

        static void Main(string[] args)
        {
            Mapper.CreateMap<Source, Target>();
            Source source = new Source() { A = 5 };
            Target target = new Target() { A = 5 };

            Mapper.Map<Source, Target>(source, target);

            Console.WriteLine(source.A);
            Console.WriteLine(target.A);

        }
    }
}