using System;

using System.Linq;

using System.Collections.Generic;

public class Program

{   

    static List<string> listBox1 = new List<string>();

    public static void Main()

    {

        button1_Click();        

    }

    public static void button1_Click()

    {

        string[] teste = new string[] { "um", "dois", "tres", "quatro", "cinco" };

​

        Predicate<string> p = objetoTeste => objetoTeste.Length >= 4;

​

        var i = from items in teste

                 where (p(items))

                 select (items);

        i.ToList().ForEach(item => listBox1.Add(item));

        listBox1.ForEach(Console.WriteLine);

    }

}