Tutorials ADO.NET Core Tutorial
Async Database Operations — Complete Guide
Async Database 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 42 of 100
Async Database Operations
Foundations ✓ → SQL & safety → Production → Projects
SQL & safety · 2 — Procs, tx, performance · ~6 min · Module 5: Performance Optimization
What is this?
Production async means the whole stack awaits SQL — including cancellation and ConfigureAwait in libraries.
Why should you care?
This deepens Async Operations for ShopNest APIs under cancellation and load.
See it live — copy this example
Use a .NET console or API project with SQL Server LocalDB. Run dotnet run after pasting.
public async Task<int> CountPendingAsync(CancellationToken ct)
{
await using var conn = new SqlConnection(cs);
await conn.OpenAsync(ct);
await using var cmd = new SqlCommand(
"SELECT COUNT(*) FROM Orders WHERE Status=@s", conn);
cmd.Parameters.Add("@s", SqlDbType.NVarChar, 20).Value = "Pending";
return (int)(await cmd.ExecuteScalarAsync(ct))!;
}What happened?
- Pass ct everywhere.
- Scalar for aggregates.
- No sync-over-async bridges.
Practice next
- build CountPendingAsync.
- Cancel from a test.
- Call from minimal API.
- Add timeout via ct linkage.
- Parallel queries carefully (separate connections).
Remember
Full async path. CancellationToken. Scalar for counts.
ShopNest async count API
Dashboard badge uses CountPendingAsync.
Outcome: Cancels cleanly when client disconnects.
Interview prep for this lesson
Practice these questions aloud after reading—each links to a full structured answer.
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