private static byte[] StreamToBytes(Stream fs)

        {

            byte[] bArr = new byte[fs.Length];

            fs.Read(bArr, , (int)fs.Length);

            fs.Seek(, SeekOrigin.Begin);

            return bArr;

        }

        public static Stream BytesToStream(byte[] bytes)

        {

            Stream stream = new MemoryStream(bytes);

            return stream;

        }

        public static byte[] FileToBytes(string path)

        {

            using (FileStream fileStream = new FileStream(path, FileMode.Open, FileAccess.Read))

            {

                byte[] bArr = new byte[fileStream.Length];

                fileStream.Read(bArr, , bArr.Length);

                return bArr;

            }

        }

        public static string BytesToFile(string directoryPath,byte[] bArr,string fileName)

        {

            if (!Directory.Exists(directoryPath))

            {

                Directory.CreateDirectory(directoryPath);

            }

            string path = directoryPath + "\\" + fileName;

            using (FileStream fileStream = new FileStream(path, FileMode.OpenOrCreate, FileAccess.Write))

            {

                fileStream.Seek(, SeekOrigin.Begin);

                fileStream.Write(bArr, , bArr.Length);

            }

            return path;

        }