using System;

using AutoMapper;

​

​

public class Source

{

    public int ValueInt { get; set; }

}

​

public class Destination

{

    public string ValueString { get; set; } 

}

​

public class Program

{

    public static void Main()       

    {

        var config = new MapperConfiguration(cfg => { 

            cfg.CreateMap<Source, Destination>()

                .ForMember(dest => dest.ValueString, opt => opt.MapFrom(src => src.ValueInt.ToString()))

                .ReverseMap()

                .ForMember(dest => dest.ValueInt, opt => opt.MapFrom(src => Int32.Parse(src.ValueString)));      

        });

        IMapper mapper = config.CreateMapper();

        var source = new Source { ValueInt = 100 };

        Console.WriteLine(source.ValueInt);

        var dest = mapper.Map<Destination>(source);

        Console.WriteLine(dest.ValueString);

        var sourceReverse = mapper.Map<Source>(dest);

        Console.WriteLine(sourceReverse.ValueInt);

    }

}