How Can i Find that the mac address of client wether he is useing is Fake one our origenal in C# or VB or C++

Some people use Mac Changer softwares to change there macs plz helpHow Can i Find that the mac address of client wether he is useing is Fake one our origenal in C# or VB or C++
If the code does not run on the client where the MAC has been changed, you can't find out if it is fake.



Sorry ...