How To Structure An ASP.NET Core MVC Project For Real Work

Why structure matters

A small MVC project can survive with everything inside controllers, but a real business application quickly needs cleaner boundaries. Separating controllers, services, repositories, domain models, view models, and utility code keeps the project easier to test, debug, and extend.

A practical folder approach

Keep the web project focused on HTTP concerns: controllers, Razor views, filters, middleware, layouts, and static assets. Move business decisions into the service layer. Keep SQL access inside repositories and expose simple async methods to the services.

Recommended flow

1. The controller receives the request and validates the route or form model.
2. The service applies business rules and prepares the final result.
3. The repository executes stored procedures through Dapper.
4. The Razor view renders a focused view model.

Common mistake

Avoid placing SQL, email sending, file upload decisions, and payment calculations directly inside controller actions. The code may work today, but it becomes difficult to maintain when modules such as clients, projects, invoices, and support tickets start sharing rules.

Student practice

Pick one module such as Client Management and design it end to end with a model, form view model, repository, service, controller, Razor views, table script, and stored procedure. That exercise teaches the complete flow clearly.