internal class Program
{
	private static void Main(string[] args)
	{
		var ints = MyIEnumrable.FromTo(0, 10);
		foreach (var i in ints)
			Console.WriteLine("{0}", i);
	}
}

internal class MyIEnumrable
{
	public static IEnumerable<int> FromTo(int from, int to)
	{
		while (from <= to)
			yield return from++;
	}
}