Can you describe a situation where a co-worker asked you for information that you knew to be confidential?

I would answer him with a smile, that this is confidential .

For situation like this, I must keep the secret with in me and the company. I must give my full loyalty in return for trust given to me by the Company in holding such confidential issues. However, I will give him a sincere smile and tell him how sorry  but I am not in the right position to answer his question. 

Just remind them that we all have signed a confidentiality agreement when we join