AutoMapper.cs

public class ProductComments
    {
    public int Id { get; set; }
        public virtual ApplicationUser CreatedBy { get; set; }
        public int CreatedById { get; set; }
        public DateTime CreatedOn { get; set; }
        public string Comment { get; set; }
        public string Ip { get; set; }
        public string UserAgent { get; set; }
        public int Likes { get; set; }
        public int Dislikes { get; set; }

        public ProductComments Parent { get; set; }
        public int? ParentId { get; set; }

        public virtual Product Product { get; set; }
        public int ProductId { get; set; }

        public virtual ICollection<ProductComments> Childrens { get; set; }
    }

public class CommentsViewModel : IHaveCustomMappings
    {
        public int Id { get; set; }
        public string CreatedBy { get; set; }
        public DateTime CreatedOn { get; set; }
        public string Ip { get; set; }
        public string Comment { get; set; }
        public int Likes { get; set; }
        public int Dislikes { get; set; }
        public ICollection<CommentsViewModel> Replies { get; set; }

        public void CreateMappings(IMapperConfigurationExpression configuration)
        {
            configuration.CreateMap<DomainEntities.Products.ProductComments, CommentsViewModel>()
                .ForMember(dest => dest.CreatedBy, opt => opt.MapFrom(x => x.CreatedBy.Name + " " + x.CreatedBy.Family))
                .ForMember(dest => dest.Replies, opt => opt.MapFrom(x => x.Childrens));
        }
    }