EmployeeWithAssets.cs

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

namespace ConsoleApp9.Domain
{
    [GenerateMappedDto]
    public sealed class Employee
    {
        private readonly List<CompanyAsset> assetsAllocated = 
            new List<CompanyAsset>();

        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; }
        public IReadOnlyCollection<CompanyAsset> AssetsAllocated => 
            assetsAllocated;

        public void AllocateAsset(CompanyAsset asset) => 
            assetsAllocated.Add(asset);
    }

    [GenerateMappedDto]
    public class CompanyAsset
    {
        public CompanyAsset(string name, decimal worth, string code)
        {
            Name = name;
            Worth = worth;
            AssetCode = new AssetCode(code);
        }

        public string Name { get; }
        public decimal Worth { get; }
        public AssetCode AssetCode { get; }
    }

    [GenerateMappedDto]
    public struct AssetCode
    {
        public AssetCode(string code)
        {
            Code = code;
        }

        public string Code { get; }
    }
}