"new" property solution, C#

"new" property solution

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text.RegularExpressions;

namespace Rextester
{
    public interface IDefinition
    {
        public string Sku { get; }
    }
    
    public abstract class Definition : IDefinition
    {
       // Solution 1: make property virtual
        public virtual string Sku => null;
        
        // Solution 2: make property abstract
        //public abstract string Sku { get; }
    }
    
    public class HeroDefinition : Definition
    {
        private string m_sku = "";
        public override string Sku => m_sku;
        
        public HeroDefinition(string sku)
        {
            m_sku = sku;
        }
    }
    
    
    
    public class Program
    {
        public static void Main(string[] args)
        {
            HeroDefinition heroDef = new HeroDefinition("MyHero");
            Console.WriteLine(SkuToString(heroDef.Sku));
            
            Definition baseDef = heroDef;
            Console.WriteLine(SkuToString(baseDef.Sku));
            
            IDefinition interfaceDef = heroDef;
            Console.WriteLine(SkuToString(interfaceDef.Sku));
        }
        
        private static string SkuToString(string sku)
        {
            if (sku == null)
            {
                return "NULL";
            }
            else if (sku == string.Empty)
            {
                return "EMPTY";
            }
            else
            {
                return sku;
            }
        }
    }
}


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