//what folder to zip - include trailing slash
            string dirRoot = @"c:\yourfolder\";

            //get a list of files
            string[] filesToZip = Directory.GetFiles(dirRoot, "*.*", SearchOption.AllDirectories);

            //final archive name (I use date / time)
            string zipFileName = string.Format("zipfile-{0:yyyy-MM-dd_hh-mm-ss-tt}.zip", DateTime.Now);

            using (MemoryStream zipMS = new MemoryStream())
            {
                using (ZipArchive zipArchive = new ZipArchive(zipMS, ZipArchiveMode.Create, true))
                {
                    //loop through files to add
                    foreach (string fileToZip in filesToZip)
                    {
                        //exclude some files? -I don't want to ZIP other .zips in the folder.
                        if (new FileInfo(fileToZip).Extension == ".zip") continue;

                        //exclude some file names maybe?
                        if (fileToZip.Contains("node_modules")) continue;

                        //read the file bytes
                        byte[] fileToZipBytes = System.IO.File.ReadAllBytes(fileToZip);

                        //create the entry - this is the zipped filename
                        //change slashes - now it's VALID
                        ZipArchiveEntry zipFileEntry = zipArchive.CreateEntry(fileToZip.Replace(dirRoot, "").Replace('\\', '/'));

                        //add the file contents
                        using (Stream zipEntryStream = zipFileEntry.Open())
                        using (BinaryWriter zipFileBinary = new BinaryWriter(zipEntryStream))
                        {
                            zipFileBinary.Write(fileToZipBytes);
                        }

                        //lstLog.Items.Add("zipped: " + fileToZip);
                    }
                }

                using (FileStream finalZipFileStream = new FileStream(@"c:\whateverfolder\Deploy_" + zipFileName, FileMode.Create))
                {
                    zipMS.Seek(0, SeekOrigin.Begin);
                    zipMS.CopyTo(finalZipFileStream);
                }

                //lstLog.Items.Add("ZIP Archive Created.");
            }