Indication to application for Client certificate authentication is working or not working.

Question

Hi All,
     I have done the client certificate authentication on the IIS and one to one mapping of certificate has been done. But my problem is all setup done manually, how the application come to know that client authentication is working fine or Is there is any error in certificate (say cert.. expired etc). What code can be used in .Net to verify IIS setup is working fine and Data can send using SSL link.