C#生成注册码

string t = DateTime.Now.Ticks.ToString();
          
            t = DESKey.DESEncrypt(t, DESKey.DesKeyStr);
            string[] strid = new string[t.Length];//
            for (int i = 0; i < t.Length; i++)//把字符赋给数组
            {
                strid[i] = t.Substring(i, 1);
            }
            string s = "";
            Random rdid = new Random();
            for (int i = 0; i < 9; i++)//从数组随机抽取字符组成新的字符生成机器三
            {
                s += strid[rdid.Next(0, strid.Length)];
            }

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class DESKey     {         public const string DesKeyStr = "BLUE2013";           #region DES加密         /// <summary>         /// DES加密         /// </summary>         /// <param name="pToEncrypt">需要加密的字符串</param>         /// <returns>加密后的字符串</returns>         public static string DESEncrypt(string pToEncrypt, string DesKeyStr)         {             try             {                 DESCryptoServiceProvider des = new DESCryptoServiceProvider();                 byte[] inputByteArray = Encoding.Default.GetBytes(pToEncrypt);                 des.Key = ASCIIEncoding.ASCII.GetBytes(DesKeyStr);                 des.IV = ASCIIEncoding.ASCII.GetBytes(DesKeyStr);                 MemoryStream ms = new MemoryStream();                 CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(), CryptoStreamMode.Write);                 cs.Write(inputByteArray, 0, inputByteArray.Length);                 cs.FlushFinalBlock();                 StringBuilder ret = new StringBuilder();                 foreach (byte b in ms.ToArray())                 {                     ret.AppendFormat("{0:X2}", b);                 }                 ret.ToString();                 return ret.ToString();             }             catch             {                                 return "";             }             }         #endregion           #region DES解密         /// <summary>         /// DES解密         /// </summary>         /// <param name="pToDecrypt">加密后的字符串</param>         /// <returns>解密后的字符串</returns>         public static string DESDecrypt(string pToDecrypt, string DesKeyStr)         {             try             {                 DESCryptoServiceProvider des = new DESCryptoServiceProvider();                   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;                 }                   des.Key = ASCIIEncoding.ASCII.GetBytes(DesKeyStr);                 des.IV = ASCIIEncoding.ASCII.GetBytes(DesKeyStr);                 MemoryStream ms = new MemoryStream();                 CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(), CryptoStreamMode.Write);                 cs.Write(inputByteArray, 0, inputByteArray.Length);                 cs.FlushFinalBlock();                   StringBuilder ret = new StringBuilder();                   return System.Text.Encoding.Default.GetString(ms.ToArray());             }             catch             {                                  return "";             }         }         #endregion           }