using System;

public class Program

{

    public static void Main()

    {

        var fullname = "Hans Hanseesn      ".Trim();

        var tokenpos=0;

        tokenpos = fullname.LastIndexOf(" ");

        if (tokenpos == -1) {

            throw new Exception("Må ha både for- og etternavn");

        }

        var firstname=fullname.Substring(0, tokenpos);

        var lastname=fullname.Substring(tokenpos+1);

        Console.WriteLine("Firstname='{0}', Lastname='{1}'", firstname, lastname);

    }

}