Code snippet for the blog post https://sriramsakthivel.wordpress.com/2015/01/30/oh-that-iterators/

IteratorSample.cs

public class Iterator
{
    public static void Main(string[] args)
    {
        var numbers = GetGumbers(-1);
        Console.WriteLine("Program completed successfully");
    }

    private static IEnumerable<int> GetGumbers(int end)
    {
        if (end <= 0)
        {
            throw new ArgumentOutOfRangeException("end", "Parameter 'end' should be greater than zero");
        }

        for (int i = 0; i < end; i++)
        {
            yield return i;
        }
    }
}