String sourcefilename = FILETOBEUNCOMPRESSED;
Filestream sourcefile = File.OpenRead(sourcefilename);
Filestream destinationfile = File.Create(outputfilename);
GZipStream compressionstream = new GZipStream(sourcefile, CompressionMode.Decompress);
int sourcebyte = compressionstream.ReadByte();
while(sourcebyte != -1)
{
	destinationfile.WriteByte((byte)sourcebyte);
	sourcebyte = compressionstream.ReadByte();
}
//csharp/7607