System.IO.Compression in .NET 2.0

I just realized that .NET 2.0 introduced compression/zipping functionality:

using System.IO.Compression;

MemoryStream ms = new MemoryStream();
GZipStream compressedzipStream = new GZipStream(ms , CompressionMode.Compress, true);
compressedzipStream.Write(buffer, 0, buffer.Length);
compressedzipStream.Close();