The name 'View' does not exist in the current context
The controller is not inheriting from the controller
class. MVC does many things by convention, but naming your class with "Controller" on the end is not enough.
Change it to public class FilePageController : Controller
.
By the way, Controller
class inherits from ControllerBase
class. Hence, members of ControllerBase
class are accessible from class inherited from Controller
class.