using System;

using System.Linq;

using System.Collections.Generic;

using System.Collections.ObjectModel;

public class Program

{

    public static void Main()

    {

        ICollection<Person> people = new Collection<Person>();

        people.Add(new Person());

        // Success even if the second conditional is produce exception

        if (people != null || people.ToList().FirstOrDefault().CarList.Count() > 0)

        {

            Console.WriteLine("Success");

        }

        //// Produce exception

        //if (people.ToList().FirstOrDefault().CarList.Count() > 0)

        //{

        //  Console.WriteLine("Success");

        //}

    }

}

​

public class Person

{

    private ICollection<Car> _carList;

    public string Name { get; set; }

    public int Age { get; set;}

    public ICollection<Car> CarList {

        get {

            return this._carList;

        }

        set {

            this._carList = value;

        }

    }

}

​

public class Car

{

    public string Model { get; set; }

}