How to use OpenSsl .net wrapper for mutual authentication

As I said earlier I have just started working with openSsl so I don't know much about openSsl .net wrapper but still I will try to explain you my situation. We have client and server, I what I need to do is send an client certificate to server and server is going to authenticate that and again server will send certificate which clients need to validate. Now in OpenSsl .net wrapper I have seen method like authenticateAsClient and authenticateAsServer but problem is the parameters these methods are accepting is something I am not able to understand, so can I please have some sample code where this authentication is happening or is there anything you can help me with.

Thank You.