using System;

using System.Collections.Generic;

using System.Linq;

​

public class Program

{

    public static void Main()

    {

        var x = new Test();

        Console.Write("Variable x is -> "); 

        Console.WriteLine(x == null ? "NULL" : x.ToString());

        Console.Write("The collection inside of x is -> ");

        Console.WriteLine(x.ThingsThatCanBeNull == null ? "NULL" : x.ThingsThatCanBeNull.ToString());

        Console.Write("Trying to access null properties -> ");

        Console.WriteLine((object)x.ThingsThatCanBeNull ?? (object)"NULL");

        var y = x.ThingsThatCanBeNull?.Select(thing => thing.NumberOfFcksGiven).ToList();

        Console.WriteLine();

        x = null;

        var z = x?.ThingsThatCanBeNull?.Select(thing => thing.NumberOfFcksGiven).ToList();

        Console.WriteLine("Null coalescing method calls prevents obj ref errors. ->\t" + $"{y == null && z == null}");

    }

​

​

  public class Test

  {

      public IEnumerable<TestStuff> ThingsThatCanBeNull {get;set; }

  }

​

  public class TestStuff

  {

      public string IrrelevantProperty  {   get;set; }

​

      public int NumberOfFcksGiven    { get;set;}

  }

}