EmployeeWithAddress.cs

using Genny;
using System;
using System.Collections.Generic;
using System.Linq;

namespace ConsoleApp9.Domain
{
    [GenerateMappedDto]
    public sealed class Employee
    {
        public Employee(
            string name,
            DateTime dateOfJoining)
        {
            Id = Guid.NewGuid();
            Name = name;
            DateOfJoining = dateOfJoining;
        }

        public Guid Id { get; }
        public string Name { get; }
        public DateTime DateOfJoining { get; }
	public Address? HomeAddress { get; set; }
    }

    [GenerateMappedDto]
    public class Address
    {
        public Address(
			string streetName, 
			int houseNumber, 
			string postCode)
        {
            StreetName = streetName;
            HouseNumber = houseNumber;
            PostCode = postCode;
        }

        public string StreetName { get; }
        public int HouseNumber { get; }
        public string PostCode { get; }
    }
}