کد کردن و دی کد کردن رشته در C#

/// <summary>
        /// کد کردن رشته ها
        /// </summary>
        /// <param name="str"></param>
        /// <returns></returns>
        public static string Encrypt(this string str)
        {
            string strEncrKey = "?pws#m";
            byte[] byKey;
            byte[] IV = { 18, 52, 86, 120, 144, 171, 205, 239 };

            try
            {
                byKey = System.Text.Encoding.UTF8.GetBytes(strEncrKey.Substring(0, 8));
                DESCryptoServiceProvider des = new DESCryptoServiceProvider();
                byte[] inputByteArray = Encoding.UTF8.GetBytes(str);
                MemoryStream ms = new MemoryStream();
                CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(byKey, IV), CryptoStreamMode.Write);
                cs.Write(inputByteArray, 0, inputByteArray.Length);
                cs.FlushFinalBlock();
                return Convert.ToBase64String(ms.ToArray());
            }
            catch (Exception ex)
            {
                return ex.Message;
            }
        }
/// <summary>
        /// دی کد کردن رشته ها
        /// </summary>
        /// <param name="str"></param>
        /// <returns></returns>
        public static string Decrypt(this string str)
        {
            string sDecrKey = "?pws#m";
            byte[] byKey;
            byte[] IV = { 18, 52, 86, 120, 144, 171, 205, 239 };

            byte[] inputByteArray;
            // inputByteArray.Length = strText.Length;

            try
            {
                byKey = System.Text.Encoding.UTF8.GetBytes(sDecrKey.Substring(0, 8));
                DESCryptoServiceProvider des = new DESCryptoServiceProvider();
                inputByteArray = Convert.FromBase64String(str);
                MemoryStream ms = new MemoryStream();
                CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(byKey, IV), CryptoStreamMode.Write);
                cs.Write(inputByteArray, 0, inputByteArray.Length);
                cs.FlushFinalBlock();
                System.Text.Encoding encoding = System.Text.Encoding.UTF8;
                return encoding.GetString(ms.ToArray());
            }
            catch (Exception ex)
            {
                return ex.Message;
            }
        }
Example:
Encrypt:uN3ZxZKd2a4=
Decryp2:123

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