using System;
using System.Collections;
using System.Collections.Generic;

public class Test
{
	public static void Main(string[] args)
	{
		foreach (var i in new DangerousEnumerable())
		{
			Console.WriteLine(i);
			break;  // consumer decides to abort
		}
	}
}

public class Resource : IDisposable
{ 
	public Resource() 
	{
		Console.WriteLine("Resource acquired!");
	}

	public void Dispose()
	{
		Console.WriteLine("Resource disposed!");
	}
}

public class DangerousEnumerable : IEnumerable<int>
{
	public IEnumerator<int> GetEnumerator()
	{
		using (new Resource()) 
		{
			yield return 1;
			yield return 2;
		}
		Console.WriteLine("Finished!");
	}

	IEnumerator IEnumerable.GetEnumerator()
	{
		return GetEnumerator();
	}
}