Bitwise Hex

[papriko]

Hello
I'm newbie here
I'm developing a GUI to manipulate the RS232 with a MyFARE Card Reader (some kind of RFID reader)
I order to write or to read a block from the card, I send Hex message like "16 00 49 ab 47 xx" where xx is the checksum (the bitwise in Hex) of all other numbers (so : 16, 00, 49, 47)
I Google it but all I can find is bitwise in binary not in hex, someone suggested that I convert all my numbers from hex to bin then do the bitwise with the '|' operator then convert back to hex .... I tried but actually never succeed it.
So is there anyway to manage this problem for me ?

I resume :
Input : 16 00 49 ab 47
output : the checksum of input
16 = 00010110
49 = 01001001
47 = 01000111
======================== (XOR columns)
x = 00011000 = 18

thanks in advance
PS: i'm using Visual 2010