Tutorials ADO.NET Core Tutorial
High-Performance APIs — Complete Guide
High-Performance APIs — 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 50 of 100
High-Performance APIs
Foundations ✓ → SQL & safety → Production → Projects
SQL & safety · 2 — Procs, tx, performance · ~6 min · Module 5: Performance Optimization
What is this?
High-performance data APIs combine async ADO.NET, tight SQL, pooling, caching, and minimal allocation mapping.
Why should you care?
ShopNest product card API is on the critical path every page view.
See it live — copy this example
Use a .NET console or API project with SQL Server LocalDB. Run dotnet run after pasting.
cmd.CommandText = "SELECT Sku, Name, Price FROM Products WHERE Sku=@Sku";
cmd.Parameters.Add("@Sku", SqlDbType.NVarChar, 32).Value = sku;
await using var r = await cmd.ExecuteReaderAsync(ct);
if (await r.ReadAsync(ct))
return new ProductCard(r.GetString(0), r.GetString(1), r.GetDecimal(2));What happened?
- Single-row read.
- Indexed Sku.
- Optional cache.
- No SELECT *.
Practice next
- build ProductCard query.
- Index Sku.
- Add memory cache 30s.
- Dapper for mapping compare.
- Measure allocations.
Remember
Tight SQL + async. Index lookups. Cache safely.
ShopNest PDP card API
Sku lookup via ADO.NET + cache.
Outcome: p95 stays under budget.
Interview prep for this lesson
Practice these questions aloud after reading—each links to a full structured answer.
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