Can you not use response.redirect?
You might want to create a global variable (or Session variable) that indicates whether you should use HTTP or HTTPS for the current user (you could also add it to the users object) and then any time you make a reference to a URL you use your variable for the front.
Also take a look at HTTPModules.
stbuchok
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In session login check whether user is paid or free and depending upon its value redirect it to http or https url
aspproject
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