求一段代码 如何用C# 来实现？等大牛100分送上

这是C#一个可逆的加密解密算法,我也在用

using System;   
using System.IO;   
using System.Security.Cryptography;   
  
using System.Text;   
  
namespace DataCrypto   
{   
 /// <summary>   
 /// 对称加密算法类   
 /// </summary>   
 public class SymmetricMethod   
 {   
    
 private SymmetricAlgorithm mobjCryptoService;   
 private string Key;   
 /// <summary>   
 /// 对称加密类的构造函数   
 /// </summary>   
 public SymmetricMethod()   
 {   
 mobjCryptoService = new RijndaelManaged();   
 Key = "Guz(%&hj7x89H$yuBI0456FtmaT5&fvHUFCy76*h%(HilJ$lhj!y6&(*jkP87jH7";   
 }   
 /// <summary>   
 /// 获得密钥   
 /// </summary>   
 /// <returns>密钥</returns>   
 private byte[] GetLegalKey()   
 {   
 string sTemp = Key;   
 mobjCryptoService.GenerateKey();   
 byte[] bytTemp = mobjCryptoService.Key;   
 int KeyLength = bytTemp.Length;   
 if (sTemp.Length > KeyLength)   
 sTemp = sTemp.Substring(0, KeyLength);   
 else if (sTemp.Length < KeyLength)   
 sTemp = sTemp.PadRight(KeyLength, ' ');   
 return ASCIIEncoding.ASCII.GetBytes(sTemp);   
 }   
 /// <summary>   
 /// 获得初始向量IV   
 /// </summary>   
 /// <returns>初试向量IV</returns>   
 private byte[] GetLegalIV()   
 {   
 string sTemp = "E4ghj*Ghg7!rNIfb&95GUY86GfghUb#er57HBh(u%g6HJ($jhWk7&!hg4ui%$hjk";   
 mobjCryptoService.GenerateIV();   
 byte[] bytTemp = mobjCryptoService.IV;   
 int IVLength = bytTemp.Length;   
 if (sTemp.Length > IVLength)   
 sTemp = sTemp.Substring(0, IVLength);   
 else if (sTemp.Length < IVLength)   
 sTemp = sTemp.PadRight(IVLength, ' ');   
 return ASCIIEncoding.ASCII.GetBytes(sTemp);   
 }   
 /// <summary>   
 /// 加密方法   
 /// </summary>   
 /// <param name="Source">待加密的串</param>   
 /// <returns>经过加密的串</returns>   
 public string Encrypto(string Source)   
 {   
 byte[] bytIn = UTF8Encoding.UTF8.GetBytes(Source);   
 MemoryStream ms = new MemoryStream();   
 mobjCryptoService.Key = GetLegalKey();   
 mobjCryptoService.IV = GetLegalIV();   
 ICryptoTransform encrypto = mobjCryptoService.CreateEncryptor();   
 CryptoStream cs = new CryptoStream(ms, encrypto, CryptoStreamMode.Write);   
 cs.Write(bytIn, 0, bytIn.Length);   
 cs.FlushFinalBlock();   
 ms.Close();   
 byte[] bytOut = ms.ToArray();   
 return Convert.ToBase64String(bytOut);   
 }   
 /// <summary>   
 /// 解密方法   
 /// </summary>   
 /// <param name="Source">待解密的串</param>   
 /// <returns>经过解密的串</returns>   
 public string Decrypto(string Source)   
 {   
 byte[] bytIn = Convert.FromBase64String(Source);   
 MemoryStream ms = new MemoryStream(bytIn, 0, bytIn.Length);   
 mobjCryptoService.Key = GetLegalKey();   
 mobjCryptoService.IV = GetLegalIV();   
 ICryptoTransform encrypto = mobjCryptoService.CreateDecryptor();   
 CryptoStream cs = new CryptoStream(ms, encrypto, CryptoStreamMode.Read);   
 StreamReader sr = new StreamReader(cs);   
 return sr.ReadToEnd();   
 }   
 } 

我已经解决了