using System;

public class Program

{

    public static void Main()

    {

        int[] array = null;

        if (array == null || array.Length == 0)

        {

            Console.WriteLine("Condition 1 met");

        }

        if (array?.Length == 0)

        {

            Console.WriteLine("Condition 2 met");

        }

        if ((array?.Length ?? 0) == 0)

        {

            Console.WriteLine("Condition 3 met");

        }

    }

}