GetSerialNumber gives different value than SerialNumber in an X509Certificate2

Question

I have a certificate data (byte array):

var cert = new X509Certificate2(certBytes);
var serialBytes = cert.GetSerialNumber();
var serialString = cert.SerialNumber;

when converting serialBytes to hex format:

BitConverter.ToString(serialBytes).Replace("-","")

it gives a different value than serialString

Answer 1

Because you should read the documentation:

X509Certificate.GetSerialNumber Returns the serial number of the X.509v3 certificate as an array of bytes in little-endian order.

X509Certificate2.SerialNumber Gets the serial number of a certificate as a big-endian hexadecimal string.