Yield return example

using System;
using System.Collections;

namespace Test
{
    class Program
    {
        static void Main()
        {
            foreach (string car in TopCars())
            {
                Console.Write(car + " ");
            }

            // Output: Lamborghini Ferrari BMW Lada
        }

        public static IEnumerable TopCars()
        {
            yield return "Lamborghini";
            yield return "Ferrari";
            yield return "BMW";
            yield return "Lada";
        }
    }
}