public void ArchiveByteArray() { byte[] myByteArray = Enumerable.Repeat((byte)0x78, 10000).ToArray(); using (Stream myZippedStream = new FileStream("Documents\\ArchiveByteArray.zip", FileMode.Create)) { using (ZipArchive archive = new ZipArchive()) { archive.AddByteArray("myByteArray", myByteArray); archive.Save(myZippedStream); } } }