using System;

using System.Linq;

using System.Globalization;

​

public class Program

{

    public static void Main()

    {

        var teststring = "FirstName MiddleName LastName";

        Print(teststring, x => x.ToLower());

        Print(teststring, x =>

        {

            return x.ToUpper();

        }

        );  

        Print(teststring, x =>

        {

            var txtInfo = new CultureInfo("en-us", false).TextInfo;

            return txtInfo.ToTitleCase(x);

        }

        );

        Print(teststring, FirstName);

        Print(teststring, LastName);

    }

​

    private static void Print(string input, Func<string, string> func)

    {

        Console.WriteLine(func(input));

    }

​

    private static string FirstName(string input)

    {

        var split = input.Split(' ');

        return split.First();

    }

​

    private static string LastName(string input)

    {

        var split = input.Split(' ');

        return split.Length > 1 ? string.Join(" ", split.Skip(1)) : string.Empty;

    }

}