Tutorials ADO.NET Core Tutorial
ADO.NET Architecture — Complete Guide
ADO.NET 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 2 of 100
ADO.NET Architecture
Foundations → SQL & safety → Production → Projects
Foundations · 1 — Connections & CRUD · ~6 min · Module 1: ADO.NET Fundamentals
What is this?
ADO.NET stacks as app → connection → command → SQL Server → reader/rows-affected → mapped DTOs.
Why should you care?
When ShopNest times out, you must know whether the pool, SQL, or mapping layer failed.
See it live — copy this example
Use a .NET console or API project with SQL Server LocalDB. Run dotnet run after pasting.
// ShopNest request path
// Controller → IOrderRepository → SqlConnection + SqlCommand
// → SQL Server → SqlDataReader → OrderDto → JSONWhat happened?
- Repositories hide SqlClient.
- One connection per operation (or scoped request).
- Readers stream; NonQuery returns counts.
Practice next
- Draw the five boxes.
- Mark where dispose returns the connection.
- Compare to EF’s change tracker layer.
- Add CancellationToken on OpenAsync.
- Log conn.State transitions.
Remember
Know the pipeline. Repo hides ADO.NET. Dispose = pool return.
ShopNest layered data access
Controllers never touch SqlConnection.
Outcome: Incidents point to SQL or pool, not controllers.
Interview prep for this lesson
Practice these questions aloud after reading—each links to a full structured answer.
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