Compression

 
using System;
using System.IO;
using System.IO.Compression;

using System.Linq;
using System.Text;

class Program
{
    static void Main()
    {
        string[] words = "this is a test".Split(); 
        Random rand = new Random();

        using (Stream s = File.Create("compressed.bin"))
        using (Stream ds = new DeflateStream(s, CompressionMode.Compress))
        using (TextWriter w = new StreamWriter(ds))
            for (int i = 0; i < 10; i++)
                w.Write(words[rand.Next(words.Length)] + " ");
        Console.WriteLine(new FileInfo("compressed.bin").Length); 
        using (Stream s = File.OpenRead ("compressed.bin")){
            using (Stream ds = new DeflateStream(s, CompressionMode.Decompress)){
                using (TextReader r = new StreamReader(ds)){
                    Console.Write(r.ReadToEnd()); 
                }    
            }
        }
    }
}