a simple singleton pattern class using .NET 4's Lazy type

singleton.cs

using System;

namespace SingletonExample
{
    public sealed class Singleton
    {
        private static volatile Singleton instance;
        private static object syncRoot = new Object();

        private Singleton() {}

        public static Singleton Instance
        {
            get
            {
                if (instance == null)
                {
                    lock (syncRoot)
                    {
                        if (instance == null)
                            instance = new Singleton();
                    }
                }
                return instance;
            }
        }
    }
}