These frameworks are useful for integration testing, but they can't provide unit testing, that is, testing the View isolated from persistence, business logic, whatever.
For unit testing Asp.Net Webforms, as well as MVC, you can use Ivonna. For example, you can mock your database access and verify that the mocked records are displayed in the datagrid. Or you can mock the membership provider and test the logged in scenario without having to navigate to the login page and entering your credentials, as with integration testing.
