Tutorials ADO.NET Core Tutorial
Event-Driven Systems — Complete Guide
Event-Driven Systems — 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 67 of 100
Event-Driven Systems
Foundations ✓ → SQL & safety ✓ → Production → Projects
Production · 3 — ASP.NET & enterprise · ~10 min · Module 7: Advanced Enterprise Topics
What is this?
Event-driven flows commit SQL then publish events (outbox) so workers react asynchronously.
Why should you care?
ShopNest email/search should not run inside the checkout transaction.
See it live — copy this example
Use a .NET console or API project with SQL Server LocalDB. Run dotnet run after pasting.
await using var tx = (SqlTransaction)await conn.BeginTransactionAsync(ct);
// insert order + outbox row
await tx.CommitAsync(ct);
// relay publishes order_placedWhat happened?
- Outbox pattern with ADO.NET.
- Consumers use their own SqlConnections.
Practice next
- Insert outbox row.
- Relay publish.
- Consumer upserts read model.
- Poison message table.
- Lag metric.
Remember
Outbox + ADO.NET. Async consumers. Dedupe.
ShopNest order_placed pipeline
Outbox feeds search indexer.
Outcome: Checkout doesn’t wait on Elastic.
Interview prep for this lesson
Practice these questions aloud after reading—each links to a full structured answer.
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