Resolved-String to Byte[]?

[gamesguru]

OK, there's two ways to do this, but I only need the 2nd one.
1) Convert string to corresponding byte[] value (i.e "adslfI" == {0x44, 0x55)) (Not really true, but you get the idea) I don't need this one!
and
2) Convert it as if it was a byte array, so: in a textBox I put in: "44 AF 8E", and then it's converted to a byte array: {0x44, 0xAF, 0x8E}.

I've looked at various ASCII encoding and none get the job done, probably needs a for loop and some other crap...