Microsoft IIS Web Server and ASP.NET Forum

Is there any one who can do a favor to me? I have been trying to develop a tool in asp.net which can tell me the PR and last cache date of a web page. I tried it using the Google web service but failed. I need someone's help in this regard. For your kind information I think it's right to tell you that - first of all I added a web reference to my project. Then I got the access to google's namespace. I tried with the methods which have been described in some of the online threads, but got no result. I tried with doGetCachedPage() for getting cached size of the page, but this displays a result even for a invalid input(page which is not cached and even for an input with .com extention). So I got confused. If anybody has a solution for this, then please put your ideas here.