using System;

public class Program

{

    public static void Main()

    {

        using(new DataManagerNotificationProvider()) { }

    }

    class TypedNotificationProvider 

    {

        public void Dispose() 

        {

            Console.WriteLine("TypedNotificationProvider");

        }

    }

    class DataManagerNotificationProvider  : TypedNotificationProvider, IDisposable { 

        public void Dispose() 

        {

            Console.WriteLine("DataManagerNotificationProvider");

        }

    }

}