How do I unzip the files and folders from base64 string zip files from database?

byte[] dataFromBlob = item.BlobData;

                        using (MemoryStream ms = new MemoryStream(dataFromBlob))
                        {
                            using (ZipArchive zipArchive = new ZipArchive(ms))
                            {
                                foreach (var entry in zipArchive.Entries)
                                {
                                    using (var ims = new MemoryStream())
                                    {
                                        if (!entry.FullName.Contains("."))
                                        {
                                           string entryfullname = entry.FullName.Substring(0, entry.FullName.Length - 1);
                                            //entry.Open().CopyTo(ims);
                                            //File.WriteAllBytes(filePath + entryfullname, ims.GetBuffer());
											
											I do not know how do I read files from inside this entryfullname which is a folder and inside the folder there are files. 
                                        }
                                        else
                                        {
                                            entry.Open().CopyTo(ims);
                                            File.WriteAllBytes(filePath + entry.FullName, ims.GetBuffer());
                                        }
                                       
                                    }

                                }
                            }