Unzip .gz file using Gzipstream class in C#

private static void Compress(Stream source, Stream destination)
{
    // We must explicitly close the output stream, or GZipStream will not
    // write the compression's footer to the file.  So we'll get a file, but
    // we won't be able to decompress it.  We'll get back 0 bytes.
    using(GZipStream output = new GZipStream(destination, CompressionMode.Compress)) {
        Pump(source, output);
    }
}


private static void Decompress(Stream source, Stream destination)
{
    using(GZipStream input = new GZipStream(source, CompressionMode.Decompress)) {
        Pump(input, destination);
    }
}


private static void Pump(Stream input, Stream output)
{
    byte[] bytes = new byte[4096];
    int n;
    while((n = input.Read(bytes, 0, bytes.Length)) != 0) {
        output.Write(bytes, 0, n);
    }
}

String inputFileName = @"fully qualified path to input file";
String outputFileName = @"fully qualified path to output file";

// no checks/tidyups done on itput/output file(s)

Stream src = null;
Stream dest = null;
dest = File.Create(outputFileName);
using(src = File.OpenRead(inputFleName)) {
    using(dest)
    {
        Decompress(src, dest);
    }
}

// Given filePath    = location of file
//       newFileName = name of file to save
//
// Ensure you have "using System.IO.Compression"

FileInfo file = new FileInfo(filePath);

using (FileStream originalFileStream = file.OpenRead())
{
    using (FileStream outputfileStream = File.Create(newFileName))
    {
        using (GZipStream gZipStream = new GZipStream(originalFileStream,
                                                     CompressionMode.Decompress))
        {
            gZipStream.CopyTo(outputfileStream);
        }
    }
}