using System;

using System.Collections.Generic;

public class Program

{

    public static void Main()

    {

        List<Person> lijstje = getLijstje();    

        Render("Before filter", lijstje);

        //Demo Lambda - old scool

        List<Person> gefilterd = new List<Person>();

        foreach(Person p in lijstje)

        {

            if(LastnameSmulders(p)){

                gefilterd.Add(p);

            }

        }

        Render("After filter", gefilterd);

    }

    public static bool LastnameSmulders(Person person)

    {

        return person.Lastname == "Smulders";

    }

    //Test data

    public static List<Person> getLijstje(){

        List<Person> lijstje = new List<Person>();

        lijstje.Add(new Person("Ger", "Saris"));

        lijstje.Add(new Person("Martijn", "Schuurmans"));

        lijstje.Add(new Person("Stijn", "Smulders"));

        lijstje.Add(new Person("Bart", "Mutsaers"));

        return lijstje;

    }

    //Render list on console

    public static void Render(string msg, List<Person> lijstje){

        Console.WriteLine("#### " + msg + " ####");

        lijstje.ForEach(p => Console.WriteLine(p.Firstname + " " + p.Lastname));

    }

}

​

​

public class Person

{

    public Person(string f, string l){

        this.Firstname = f;

        this.Lastname = l;

    }

    public string Firstname {get; set;}

    public string Lastname {get; set;}

}

​

​