Couple of years ago I did a blog post about using PostBackUrl with PHP . Although the code sample I used as illustration was a ASP.net page in it's simplest form, real world ASP.net pages aren't as simple as that. Almost any ASP.net web app that does a little more than just input some form data and flush it out would be doing so with the help of user controls and/or Master Pages. This complicates the HTML form entity names as it prefixes the user specified IDs with a number of _ (underscores...