using System;
using System.Collections.Generic;
using System.Linq;
public class Program
{
public class A
public B B;
}
public class B
public string Hoho;
public static void Main()
List<int> c = null;
c?.OrderBy(i=>i)
.ThenByDescending(i=>i)
.ThenBy(i=>i)
.ToArray();
Console.WriteLine($"All good {c}");
A a = null;
Console.WriteLine($"All good2 {a?.B.Hoho}");