using System;

using System.Collections.Generic;

using System.Linq;

public class Program

{

    public static void Main()

    {

        var array = new List<int> { 99, 98, 92, 97, 95};

        var array2 = new int[] { 90, 91, 92, 93 };

        var found = array2.SingleOrDefault(i => i < 80);

        Console.WriteLine(found == default);

        Console.WriteLine(found == null);

    }

}