字符串 To 字节数组 的转换

 #region string to byte[].

  public static byte[] Str2Arr(String s)
  {
   return (new UTF8Encoding()).GetBytes(s);
   //return (new UnicodeEncoding()).GetBytes(s);
  }
  #endregion

  #region byte[] to string.
  public static string Arr2Str(byte[] buffer)

  {
   return (new UnicodeEncoding()).GetString(buffer, 0, buffer.Length);
  }
  #endregion