Why should you care?

Filters keep controllers thin and apply cross-cutting rules in one place.

See it live — copy this example

Create an MVC project (dotnet new mvc), add the code, and run dotnet run.

// Custom Error Pages — ShopNest.Mvc example
public class HomeController : Controller
{
    public IActionResult Index() => View();
}

Run Example »

Edit the code and click Run — like W3Schools Try it Yourself.

What happened?

• Study the example line by line.
• Each part connects to Custom Error Pages.
• Edit one line, save, and run dotnet run to see what changes.

Try it yourself

1. Register or apply the filter from the example.
2. Hit an action that should trigger it.
3. Check logs or response headers to confirm it ran.
4. Change text or labels in the example and run again — watch the browser update.
5. Break the code on purpose (remove a semicolon), read the error message, then fix it.

Remember

You learned what Custom Error Pages is and when to use it. Practice by changing the example yourself. Explain it in your own words before moving on.