Шифрование XML файла

                byte[] Key = Encoding.Default.GetBytes("key12345678");
                Array.Resize(ref Key, 16);
                RijndaelManaged RMCrypto = new RijndaelManaged();
                //RMCrypto.Mode = CipherMode.ECB;
                RMCrypto.Padding = PaddingMode.Zeros;
                RMCrypto.KeySize = 128;
                RMCrypto.Key = Key;
 
                FileStream fs = new FileStream("settingsENK.xml", FileMode.Create);
 
                ICryptoTransform Encryptor = RMCrypto.CreateEncryptor();
                CryptoStream cs = new CryptoStream(fs, Encryptor, CryptoStreamMode.Write);
                xDoc.Save(cs);
                cs.Flush();
                fs.Flush();
                cs.Dispose();
                fs.Dispose();
 
                FileStream file = new FileStream(filePath,FileMode.Open);
                ICryptoTransform Decryptor = RMCrypto.CreateDecryptor();
                CryptoStream cs1 = new CryptoStream(file, Decryptor, CryptoStreamMode.Read);
                StreamReader srDec = new StreamReader(cs1);
                
                XDocument xDoc1 = XDocument.Load(srDec);

XDocument xDoc1 = XDocument.Load(srDec);

char[] charsToTrim = { '\0', ' ' };
TextReader tr = new StringReader(srDec.ReadToEnd().ToString().Trim(charsToTrim));
XDocument xDoc1 = XDocument.Load(tr);