First

using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;

class Program
{
    static void Main()
    {
        int[] numbers = { 1, 2, 3, 4, 5 };
        int first = numbers.First();
        int firstEven = numbers.First(n => n % 2 == 0);
        Console.WriteLine(first);
        Console.WriteLine(firstEven);
    }
}