Need to ZIP Azure Blob Container using c#

using (ZipFile zipFile = new ZipFile())
{
    foreach (var uri in uriCollection)
    {
        var blob = new CloudBlob(uri);

        byte[] fileBytes = blob.DownloadByteArray();

        using (var fileStream = new MemoryStream(fileBytes))
        {
            fileStream.Seek(0, SeekOrigin.Begin);
            
            //U May avoid encryption 
            byte[] bytes = CryptoHelp.EncryptAsBytes(fileStream, "password", null);

            zipFile.AddEntry("entry name", bytes);
        }
    }

    using (var zipStream = new MemoryStream())
    {
        zipFile.Save(zipStream);
        zipStream.Seek(0, SeekOrigin.Begin);

        var blobRef = ContainerDirectory.GetBlobReference("output uri");
        blobRef.UploadFromStream(zipStream);
    }

}