using System;
using System.Linq;
using System.Collections.Generic;
using System.Globalization;
using System.Net;

public class Test
{
  
	public static void Main()
	{
        bool IsDisposable = typeof(IDisposable).IsAssignableFrom(typeof(System.IO.TextWriter));
        Console.WriteLine("Is TextWriter disposable? " + IsDisposable);
	}   
}