using System;

using System.Linq;

public class Program

{

    public static void Main()

    {

        // First

        Console.WriteLine( new string[] { "a" }.First() );                                  // returns "a"

        Console.WriteLine( new string[] { "a", "b" }.First() );                             // returns "a"

        Console.WriteLine( new string[] { "a", "b" }.First(x => x.Equals("b")) );           // returns "b"

        Console.WriteLine( new string[] { "a", "ba", "be" }.First(x => x.Contains("b")) );  // returns "ba"

    }

}