C# Base64-Encoder

base64-encode.cs

using System;
using System.IO;

public class Base64EncodeApp
{
	public static void Main(string[] args)
	{
		if (args.Length < 1)
		{
			Console.WriteLine("usage: base64-encode.exe <filename>");
			return;
		}

		using (FileStream fs = File.OpenRead(args[0]))
		{
			byte[] data = new byte[fs.Length];
			fs.Read(data, 0, (int)fs.Length);
			Console.WriteLine(Convert.ToBase64String(data));
		}
	}
}