如何让自定义IHttpHandler能够处理回发？

I am writing a custom HTTP handler to provide an edit form for a grid using existing user controls. Basically, my handler creates the page, form, header, and other controls necessary to be able to render the existing user controls properly and at the end of ProcessRequest, I use Server.Execute to execute the page that was dynamically created. I am doing this because the solution where this resides is a user controls project and there are no pages, nor can we add any. This needs to be reusable for several projects.I am writing a custom HTTP handler to provide a