Dear Sirs

I have a huge spreasheet with a long list of information. I need to compare two different columns and paste in another column the result.:
i.e.: if A1 = B1 Paste in C1 " OK" if not, Paste in C1 "NOK".
The code must check the columns entirely until the first blank row.
I understand that we can have this quickly using a excel formula. But a would like to include this request in another Macro.

O really apprecite your help..
THanks in advance

Regards