fibIenum.cs

static IEnumberable<int> GenerateFibonacciNumbers(int n)
    {
        List<int> myList = new List<int>();
        for (int i = 0, j = 0, k = 1; i < n; i++)
        {
            yield return j;
            int temp = j + k;
            j = k;
            k = temp;
        }

        return myList;
    }

    public static void Main(String[] args)
    {
        foreach (int x in GenerateFibonacciNumbers(5))
        {
            Console.WriteLine(x);
        }
    }