Encrypt Files C#

encryptfiles.cs

        public void EncrpytFiles(IList<Documents> documentsList)
        {
            foreach (var document in documentsList)
            {
                TripleDESCryptoServiceProvider tdes = new TripleDESCryptoServiceProvider();
                tdes.Padding = (PaddingMode.ISO10126);
                tdes.Mode = CipherMode.CBC;
                tdes.GenerateIV();
                tdes.GenerateKey();
                tdes.CreateEncryptor();

                FileStream fStream = File.Open(document.ToString(), FileMode.OpenOrCreate);
                CryptoStream cStream = new CryptoStream(fStream,
                    new TripleDESCryptoServiceProvider().CreateEncryptor(tdes.Key, tdes.Key),
                    CryptoStreamMode.Write);

                StreamWriter sWriter = new StreamWriter(cStream);

                sWriter.WriteLine(fStream);
                sWriter.Close();
                cStream.Close();
                fStream.Close();

            }
        }