ทำ Zip file แบบใส่ (Password) พาสเวิร์ดใน C# ยังไงครับ พอดีหาโค๊ดเมืองนอกมีแต่แบบโหลดไลบารี่ เสียตังค์

public void genZipFile(string filename, string pwd)
        {
            string zipFileName;
            string fileExt;
            
            try
            {
                fileExt = Path.GetExtension(filename);
                zipFileName = filename.Replace(fileExt, ".zip");
                using (ZipOutputStream s = new ZipOutputStream(File.Create(zipFileName)))
                {
                    s.Password = pwd;
                    s.SetLevel(4); // 0 - store only to 9 - means best compression

                    byte[] buffer = new byte[4096];

                    ZipEntry entry = new ZipEntry(Path.GetFileName(filename));
                    entry.DateTime = DateTime.Now;
                    s.PutNextEntry(entry);

                    using (FileStream fs = File.OpenRead(filename))
                    {
                        int sourceBytes;
                        do
                        {
                            sourceBytes = fs.Read(buffer, 0, buffer.Length);
                            s.Write(buffer, 0, sourceBytes);
                        } while (sourceBytes > 0);
                    }
                    s.Finish();

                    s.Close();
                }
            }
            catch (Exception ex)
            {
                Console.WriteLine("Exception during processing {0}", ex);
            }
        }