An alternative (and reusable) method is to create a Control Adapter for the form which replaces the Action attribute value as the page renders.
This can then be moved from project to project with just a bit of config in the App_Browsers file.
I've just written a quick blog post about this technique:
http://martinondotnet.blogspot.com/2010/07/tip-how-to-handle-form-postbacks-when.html[
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I'm a lead developer for Freestyle Interactive Ltd where we create many wonderful websites built on Microsofts ASP.Net and Ektron CMS.
I've been developing .Net applications (both Windows and Web) since 2002.