gistfile1.cs

    public class PersonFormDto: IDto<Person>
    {
        public int Id { get; set; }

        [Required(ErrorMessage = "Hey why don't you tell me who you are?!")]
        public string Name { get; set; }

        [DisplayFormat(DataFormatString = "{0:dd/MM/yyyy}", ApplyFormatInEditMode = true)]
        [Required(ErrorMessage = "Come on now, don't be shy.")]
        public DateTime Birthday { get; set; }

        public AddressFormDto Address { get; set; }
    }
    
    public class AddressFormDto: IDto<Address>
    {
        public int Id { get; set; }

        [Display(Name = "Street")]
        [Required(ErrorMessage = "You don't have a street?")]
        public string Street { get; set; }

        [Display(Name = "House Nr.")]
        [Required(ErrorMessage = "What's your house number?")]
        public string HouseNumber { get; set; }

        [Display(Name = "Postal code")]
        [Required(ErrorMessage = "Ahum")]
        public string PostalCode { get; set; }

        [Display(Name = "City")]
        [Required(ErrorMessage = "Hey don't forget to fill in your city")]
        public string City { get; set; }
    }