The "requirement" does not make a distinct sense by a simple reason: such thing as "ASPX page" does not really exist. This is a pure programming artifact which exists only on a server side and produces a "real" page (which may be an HTML page, but also can be something else) only in HTTP response, in response to some HTTP request. So, in general case, it is not even one-to-one correspondent to any particular HTTP page, because the content of it really depends on prehistory (think about session state), and more typically, on the content of HTTP request.
This way, what you want does not generally exist.
From the other hand, an HTML page always exists on the client side (of course, only for HTTP requests with "text/html" content type), and the user always have it through the browser's "View / Page Source" or "Save Page As". So what, what to help the user to click the keyboard keys or mouse buttons? To certain extent, this is possible, but why?