This does not actually happen during the page life cycle. By the time the page object is called as a handler for the request, the .aspx parameter has already been parsed and the code has been compiled into base classes.
, . " -", " " ASP.Net, , , .
- , .
, , PageParser. , ASP.Net GetCompiledPageInstance, , .
HttpApplication " " , , , http . , - , .