C#中如何将字符串转换byte[]，同时如何将byte[]换成字符串?

C#中如何将字符串转换byte[]，同时如何将byte[]换成字符串!

1   string   to   byte  []
  string   str   =   "abcd"  ;  
  byte[]   bytes   =   System.Text.Encoding.ASCII.GetBytes(str);   
   -------------------------------------------------------------------------------------------------------------
 2   byte[]   to   string  
   
  byte[]   bytes   =   new   byte[255]   ;   
   string   str   =   System.Text.Encoding.ASCII.GetString(bytes,0,bytes.Length);  
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在附上二个方法：

   private static byte[] HexStringToByteArray(string s)
        {
            s = s.Replace(" ", "");
            byte[] buffer = new byte[s.Length / 2];
            for (int i = 0; i < s.Length; i += 2)
                buffer[i / 2] = (byte)Convert.ToByte(s.Substring(i, 2), 16);
            return buffer;
        }

　　　　///

          ///www.elivn.com
        private string ByteArrayToHexString(byte[] data)
        {
            StringBuilder sb = new StringBuilder(data.Length * 3);
            foreach (byte b in data)
                sb.Append(Convert.ToString(b, 16).PadLeft(2, '0').PadRight(3, ' '));
            return sb.ToString().ToUpper();
        }