All C# extension methods for type page
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AddJavaScript
Dynamically adds a javascript file (.js) to a page even if using master page.
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AddCSS
Dynamically adds a cascading style sheet (a.k.a. CSS) file to a page even if using master page.
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RequireOrPermanentRedirect<T>
Use this method to easily check that a required querystring both exists and is of a certain type. This lets you fire off a few checks in your page_load and then write the rest of the code on the page safe in the knowledge that the querystring exists, has a value and can be parsed as the intended data type. If the querystring is not present or is an invalid type the user is sent to the RedirectUrl. Urls starting with a tilde (~) are also supported. This url is normally the next logical level up the tree such as an admin manaagement page, a product index page or if there isn't an appropriate page then you can send the user back to the homepage.