Compress file in .Net

To create a compressed file in .Net


using
.... System.IO.Compression;
FileStream fs = new FileStream(fileName, FileMode.Open, FileAccess.Read);Byte[] buffer = new byte[fs.Length];int) fs.Length);FileStream compFile = File.Create(fileName + ".Z");GZipStream zip = new GZipStream(compFile, CompressionMode.Compress);

fs.Read(buffer, 0, (


zip.Write(buffer, 0, buffer.Length);
zip.Flush();
zip.Close();
fs.Close();

The compressed file must be uncompressed with WinZip.