//注意:密钥必须为８位        private const string m_strEncryptKey = "abcd1234";        /// 
        /// 加密字符串        /// 
        /// 明码        /// 
     
      加密后的密码
             public static string DesEncrypt(string p_strInput)        {            byte[] byKey = null;            byte[] IV = { 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF };            try            {                byKey = System.Text.Encoding.UTF8.GetBytes(m_strEncryptKey.Substring(0, 8));                DESCryptoServiceProvider des = new DESCryptoServiceProvider();                byte[] inputByteArray = Encoding.UTF8.GetBytes(p_strInput);                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 (System.Exception ex)            {                throw (ex);            }        }        /// 
        /// 解密字符串        /// 
        /// 加了密的字符串        public static string DesDecrypt(string p_strInput)        {            byte[] byKey = null;            byte[] IV = { 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF };            byte[] inputByteArray = new Byte[p_strInput.Length];            try            {                byKey = System.Text.Encoding.UTF8.GetBytes(m_strEncryptKey.Substring(0, 8));                DESCryptoServiceProvider des = new DESCryptoServiceProvider();                inputByteArray = Convert.FromBase64String(p_strInput);                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 = new System.Text.UTF8Encoding();                return encoding.GetString(ms.ToArray());            }            catch (System.Exception ex)            {                throw (ex);            }        }