using cookies in webclass

i'm new to this so i hope someone can help me out
my question is simple, how do i use the .Expires property of a cookie in webclass. I know that you can set this property in the Response object when sending the response (Response.Cookies("myCookie").Expires= ddmmyy), but how do I detect whether a cookie is expired when the webclass gets a request? there is no .Expires property in the Request object (Request.Cookies("myCookie").Expires doesn't exist)

How do I go about?

thanks in advance

anybody at all?