Why should you care?

Interviewers expect you to explain Program.cs, controllers, DI, and Swagger on a whiteboard.

See it live — copy this example

Create a Web API (dotnet new webapi), paste the example, run dotnet run, test in Swagger.

[ApiController]
[Route("api/[controller]")]
public class ProductsController : ControllerBase
{
    [HttpGet]
    public IActionResult Get() => Ok(new[] { "ShopNest" });
}

Run Example »

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

What happened?

• Study the example, run dotnet run, and test in Swagger.
• Controllers in ASP.NET Core Web API connects to earlier modules in this course.

Try it yourself

1. Read what Controllers in ASP.NET Core Web API means for ShopNest.API.
2. Type the example — do not only copy-paste.
3. Test in Swagger or Postman.
4. Change a route URL or DTO property and save — test again in Swagger or curl.
5. Return the wrong status code on purpose (404 instead of 200) and see what the client shows.

Remember

You understand Controllers in ASP.NET Core Web API in plain language. You traced or ran working C# in ShopNest.API. Move on when you can teach this topic to a friend.