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How to know previous URL without using URLReferrer ? pls read details

Posted By:      Posted Date: September 16, 2010    Points: 0   Category :ASP.Net
Hi, I am developing a .net website using Visual Studio 2008. Now this webpage should be open only from link available on other website. User should not be able to type the URL directly in browser and should not be able to open this way directly. When user logs in to other website, there is a link for my website and when user clicks on that link, then only my website should be opened up. Now, I can not use  "Request.UrlReferrer" because it is not 100% correct way as there are many ways that URLReferrer can be blocked by browser or by some antivirus or etc, so I cannot use URLReferrer on my webpage to check from where this page is opened up. Now my question is what is the best way to check on my webpage that my site has been opened up only from that source? I can also pass some querystring from that website but I am not sure how can I make sure that my webpage opens up only from that source, not when user directly types URL in the browser. Please provide some ideas on how to achieve this, Thanks in advance  

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