Tutorials ADO.NET Core Tutorial
Async Operations — Complete Guide
Async Operations — 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 16 of 100
Async Operations
Foundations → SQL & safety → Production → Projects
Foundations · 1 — Connections & CRUD · ~6 min · Module 2: CRUD Operations
What is this?
Async ADO.NET APIs (OpenAsync, ExecuteReaderAsync, ReadAsync) free threads while SQL runs.
Why should you care?
ShopNest ASP.NET request threads must not block on sync SQL under load.
See it live — copy this example
Use a .NET console or API project with SQL Server LocalDB. Run dotnet run after pasting.
await conn.OpenAsync(ct);
await using var reader = await cmd.ExecuteReaderAsync(ct);
while (await reader.ReadAsync(ct)) { /* map */ }
// Avoid on request path: conn.Open(); cmd.ExecuteReader();What happened?
- Async all the way.
- Pass CancellationToken from HTTP.
- Never async void.
Practice next
- Convert one sync method.
- Pass HttpContext.RequestAborted.
- Load-test sync vs async.
- Cancel mid-read.
- Time OpenAsync.
Remember
Async on APIs. Pass ct. No sync Open.
ShopNest async repositories
All repo methods return Task.
Outcome: Thread pool survives sale spikes.
Interview prep for this lesson
Practice these questions aloud after reading—each links to a full structured answer.
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