Base 64 streamed in C#

gistfile1.cs

using System;
using System.IO;
using System.Collections.Generic;
using System.Security.Cryptography;

namespace Base64
{
    public class Base64Stream
    {
	public static int Main(string[] args)
	{
	    try
	    {
		return Wain(args, Console.OpenStandardInput(),
			    Console.OpenStandardOutput());
	    }
	    catch (Exception ex)
	    {
		Console.Error.WriteLine(ex.Message);
		return 1;
	    }
	}

	private static int Wain(IReadOnlyCollection<string> args,
				Stream input, Stream output)
	{
	    if (input == null)
	    {
		throw new ArgumentNullException("input");
	    }
	    if (output == null)
	    {
		throw new ArgumentNullException("output");
	    }

	    using (CryptoStream cs = new CryptoStream(output, new ToBase64Transform(), CryptoStreamMode.Write))
	    {
		input.CopyTo(cs);
	    }
	    return 0;
	}
    }
}