I found out that while using the VS2008 I can't access the Page method ProcessRequest.

Watch This image...

Isn't it strange? {while building -> it will succeed}.
I might admit that it took me some time (at home) to figure it out, after all at work I remember that it has the auto complete (I think that it work there because of the ReSharper).

So I made my "Go To Definition" operation and found this out:
// Summary:
// Sets the intrinsics of the System.Web.UI.Page, such as the System.Web.UI.Page.Context,
// System.Web.UI.Page.Request, System.Web.UI.Page.Response, and System.Web.UI.Page.Application
// properties.
//
// Parameters:
// context:
// An System.Web.HttpContext object that provides references to the intrinsic
// server objects (for example, System.Web.HttpContext.Request, System.Web.HttpContext.Response,
// and System.Web.HttpContext.Session) used to service HTTP requests.
[EditorBrowsable(EditorBrowsableState.Never)]
public virtual void ProcessRequest(HttpContext context);

Enjoy.