using System;

using System.Collections;

using NHibernate.Util;

public class Program

{

    public static bool IsNullOrEmpty(IEnumerable enumerable)

        {

            return enumerable == null || !enumerable.Any();

        }

    public static void Main()

    {

        if (IsNullOrEmpty(null)) {

            Console.WriteLine("it is null");

        }

    }

}