thecodewerks

public class Singleton<T> where T : class, new()
{
        static readonly T instance = new T();

        // Explicit static constructor to tell C# compiler
        // not to mark type as beforefieldinit
        static Singleton() {  }

        protected Singleton() { }

        public static T Instance { get { return instance; } }
}

public class MySingleton : Singleton<MySingleton>
{
        // seeded so new intances will always produce the same first number
        private Random random = new Random(10);

        public double Number { get { return random.NextDouble(); } }
}