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//名称空间   
using System;   
using System.Security.Cryptography;   
using System.IO;   
using System.Text;   
   
//方法   
//加密方法   
public string Encrypt(string pToEncrypt, string sKey)   
{   
DESCryptoServiceProvider des = new DESCryptoServiceProvider();   
//把字符串放到byte数组中   
//原来使用的UTF8编码，我改成Unicode编码了，不行   
byte[] inputByteArray = Encoding.Default.GetBytes(pToEncrypt);   
//byte[] inputByteArray=Encoding.Unicode.GetBytes(pToEncrypt);   
   
//建立加密对象的密钥和偏移量   
//原文使用ASCIIEncoding.ASCII方法的GetBytes方法   
//使得输入密码必须输入英文文本   
des.Key = ASCIIEncoding.ASCII.GetBytes(sKey);   
des.IV = ASCIIEncoding.ASCII.GetBytes(sKey);   
MemoryStream ms = new MemoryStream();   
CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(),CryptoStreamMode.Write);   
//Write the byte array into the crypto stream   
//(It will end up in the memory stream)   
cs.Write(inputByteArray, 0, inputByteArray.Length);   
cs.FlushFinalBlock();   
//Get the data back from the memory stream, and into a string   
StringBuilder ret = new StringBuilder();   
foreach(byte b in ms.ToArray())   
{   
//Format as hex   
ret.AppendFormat("{0:X2}", b);   
}   
ret.ToString();   
return ret.ToString();   
}   
   
//解密方法   
public string Decrypt(string pToDecrypt, string sKey)   
{   
DESCryptoServiceProvider des = new DESCryptoServiceProvider();   
   
//Put the input string into the byte array   
byte[] inputByteArray = new byte[pToDecrypt.Length / 2];   
for(int x = 0; x < pToDecrypt.Length / 2; x++)   
{   
int i = (Convert.ToInt32(pToDecrypt.Substring(x * 2, 2), 16));   
inputByteArray[x] = (byte)i;   
}   
   
//建立加密对象的密钥和偏移量，此值重要，不能修改   
des.Key = ASCIIEncoding.ASCII.GetBytes(sKey);   
des.IV = ASCIIEncoding.ASCII.GetBytes(sKey);   
MemoryStream ms = new MemoryStream();   
CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(),CryptoStreamMode.Write);   
//Flush the data through the crypto stream into the memory stream   
cs.Write(inputByteArray, 0, inputByteArray.Length);   
cs.FlushFinalBlock();   
   
//Get the decrypted data back from the memory stream   
//建立StringBuild对象，CreateDecrypt使用的是流对象，必须把解密后的文本变成流对象   
StringBuilder ret = new StringBuilder();   
   
return System.Text.Encoding.Default.GetString(ms.ToArray());   
}   
   
//-------代码完毕--------------------  

//名称空间
using System;
using System.Security.Cryptography;
using System.IO;
using System.Text;
 
//方法
//加密方法
public string Encrypt(string pToEncrypt, string sKey)
{
DESCryptoServiceProvider des = new DESCryptoServiceProvider();
//把字符串放到byte数组中
//原来使用的UTF8编码，我改成Unicode编码了，不行
byte[] inputByteArray = Encoding.Default.GetBytes(pToEncrypt);
//byte[] inputByteArray=Encoding.Unicode.GetBytes(pToEncrypt);
 
//建立加密对象的密钥和偏移量
//原文使用ASCIIEncoding.ASCII方法的GetBytes方法
//使得输入密码必须输入英文文本
des.Key = ASCIIEncoding.ASCII.GetBytes(sKey);
des.IV = ASCIIEncoding.ASCII.GetBytes(sKey);
MemoryStream ms = new MemoryStream();
CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(),CryptoStreamMode.Write);
//Write the byte array into the crypto stream
//(It will end up in the memory stream)
cs.Write(inputByteArray, 0, inputByteArray.Length);
cs.FlushFinalBlock();
//Get the data back from the memory stream, and into a string
StringBuilder ret = new StringBuilder();
foreach(byte b in ms.ToArray())
{
//Format as hex
ret.AppendFormat("{0:X2}", b);
}
ret.ToString();
return ret.ToString();
}
 
//解密方法
public string Decrypt(string pToDecrypt, string sKey)
{
DESCryptoServiceProvider des = new DESCryptoServiceProvider();
 
//Put the input string into the byte array
byte[] inputByteArray = new byte[pToDecrypt.Length / 2];
for(int x = 0; x < pToDecrypt.Length / 2; x++)
{
int i = (Convert.ToInt32(pToDecrypt.Substring(x * 2, 2), 16));
inputByteArray[x] = (byte)i;
}
 
//建立加密对象的密钥和偏移量，此值重要，不能修改
des.Key = ASCIIEncoding.ASCII.GetBytes(sKey);
des.IV = ASCIIEncoding.ASCII.GetBytes(sKey);
MemoryStream ms = new MemoryStream();
CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(),CryptoStreamMode.Write);
//Flush the data through the crypto stream into the memory stream
cs.Write(inputByteArray, 0, inputByteArray.Length);
cs.FlushFinalBlock();
 
//Get the decrypted data back from the memory stream
//建立StringBuild对象，CreateDecrypt使用的是流对象，必须把解密后的文本变成流对象
StringBuilder ret = new StringBuilder();
 
return System.Text.Encoding.Default.GetString(ms.ToArray());
}
 
//-------代码完毕--------------------
注意：sKey输入密码的时候，必须使用英文字符，区分大小写，且字符数量是8个，不能多也不能少，否则出错。

本人使用Windows2000 Server .Net Framework SP3 ，VS.Net下在asp.net下使用成功，加密解密正常！