ASP.NET MVC interview questions and answers

Authorization, then resource, then action, then exception, then result, with global, controller, and method scopes.

Indexed names like Items[0].Name let the binder build a list.

I implement ValidationAttribute or IValidatableObject for multi-property rules.

A partial is only markup plus a model you already have.

PRG: post-redirect-get so a refresh does not resubmit the form.

Razor encodes @model values by default.

I inject services through the constructor and register them in the container.

Awaiting EF or HTTP calls frees the thread while I/O runs, which helps throughput under load.

Constraints like {id:int} reject non-integers before the action runs.

Response cache headers or in-memory cache for data.

Razor mixes HTML with C# using @ syntax to generate pages.

Data annotations on the model plus ModelState.IsValid in the action catch bad input.

Filters run before or after actions for cross-cutting concerns like auth, logging, and caching.

Conventional maps patterns in Program or RouteConfig.

Links must include area or you jump to the wrong controller.

View components can run logic and return a model

I use a base ViewModel, ViewBag for rare cases, or inject a service into the layout.

It represents an uploaded file stream in MVC actions.

Return the same ViewModel to the view so inputs repopulate.

It marks a property as required for binding success, separate from [Required] validation messages.