c# and Encoding.ASCII.GetString

Question

byte[] header = new byte[]{255, 216}; 

string ascii =  Encoding.ASCII.GetString(header);

I expect ASCII to be equal to be FFD8 (JPEG SOI marker)<

Answer 1

I once wrote a custom encoder/decoder that encoded bytes 0-255 to unicode characters 0-255 and back again.

It was only really useful for using string functions on something that isn't actually a string.