Question

Creating MVC3 Razor Helper like Helper.BeginForm()
says that it can be done using extension methods and implementing IDisposable. Can the same be done by using declarative Razor helpers eg. @helper SomeHelper(){}?

Answer 1

Sort of.
Razor helpers return raw HTML, not IDisposable, so you can’t use it with using.

However, you can create a Razor helper in App_Code to render the content, then call it from a normal extension method that writes the content directly to the page and returns a separate IDisposable.