Tutorials ADO.NET Core Tutorial
Clean Architecture — Complete Guide
Clean Architecture — Complete Guide: free step-by-step lesson with examples, common mistakes, and interview tips — part of ADO.NET Core Tutorial on Toolliyo Academy.
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ADO.NET Core Tutorial · Lesson 54 of 100
Clean Architecture
Foundations ✓ → SQL & safety ✓ → Production → Projects
Production · 3 — ASP.NET & enterprise · ~10 min · Module 6: ASP.NET Core Integration
What is this?
Clean architecture keeps domain/application free of SqlClient; ADO.NET lives in infrastructure adapters.
Why should you care?
ShopNest can swap SQL Server details without rewriting use-cases.
See it live — copy this example
Use a .NET console or API project with SQL Server LocalDB. Run dotnet run after pasting.
// Application: IOrderRepository port
// Infrastructure: SqlOrderRepository uses Microsoft.Data.SqlClient
// Web: maps HTTP → use-cases onlyWhat happened?
- Dependencies point inward.
- SqlClient reference only in Infrastructure project.
Practice next
- Move repo to Infrastructure.
- Application references abstractions only.
- Web references Application.
- Add use-case PlaceOrder.
- Test use-case with fake repo.
Remember
Ports in application. ADO.NET in infra. Inward deps.
ShopNest clean data layer
SqlClient confined to Infrastructure.
Outcome: Core logic tests without SQL.
Interview prep for this lesson
Practice these questions aloud after reading—each links to a full structured answer.
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