ASP.NET MVC interview questions and answers

POST handles the write, then redirects to a GET that shows results.

It builds URLs from endpoint names outside views, like emails or services.

Display and editor templates under DisplayTemplates folders render by type name.

IFormFileCollection or IEnumerable of IFormFile binds multi-file inputs.

It blocks a property from binding, reducing overposting.

Exception filters run in MVC filter pipeline

If ModelState is invalid I return 400 with serialized errors.

It sets cache headers for the action output.

Cookie SecurePolicy Always in production.

UserManager AddToRoleAsync after ensuring roles exist.

An attribute calls an action to validate uniqueness like email.

New the controller with mocked dependencies and call the action method.

They store localized strings.

Return Task of IActionResult and await I/O calls.

It renders content only in Dev, Staging, or Production.

Remove data-val attributes or turn off unobtrusive for the form.

It injects a service into the action signature without constructor noise.

SameSite reduces CSRF but is not perfect across all browsers and flows.

TempData is available, but I prefer explicit models into partials.

TryValidateObject with ValidationContext and assert error messages.