I need fill the zip file with pdf from the database 

i have this method but dont work 

                using (var memoryStream = new MemoryStream())
                {
                    using (var ziparchive = new ZipArchive(memoryStream, ZipArchiveMode.Create, true))
                    {
                        //for (int i = 0; i < files1.Count; i++)
                        //{
                        //    var temp = ReadFully(files1[i]);
                        //    var fileentry = ziparchive.CreateEntry(files[i].name, CompressionLevel.Fastest);
                        //    using (var zipStream = fileentry.Open()) zipStream.Write(temp,0, temp.Length);
                        //}
                        for (int i = 0; i < files.Count; i++)
                        {
                            //var temp = ReadFully(files[i].File);
                            byte[] myByte = System.Text.ASCIIEncoding.Default.GetBytes(files[i].File);
                            var fileentry = ziparchive.CreateEntry(files[i].name, CompressionLevel.Fastest);
                            using (var zipStream = fileentry.Open()) zipStream.Write(myByte, 0, myByte.Length);
                        }
                    }
                    return File(memoryStream.ToArray(), "application/zip", "TestFreddy.zip");
                }

plz help