Tutorials ADO.NET Core Tutorial
Audit Trails — Complete Guide
Audit Trails — Complete Guide: free step-by-step lesson with examples, common mistakes, and interview tips — part of ADO.NET Core Tutorial on Toolliyo Academy.
On this page
ADO.NET Core Tutorial · Lesson 39 of 100
Audit Trails
Foundations ✓ → SQL & safety → Production → Projects
SQL & safety · 2 — Procs, tx, performance · ~6 min · Module 4: Transactions and Error Handling
What is this?
Audit trails record who changed what — via audit tables written in the same transaction.
Why should you care?
ShopNest finance requires proof of price and refund changes.
See it live — copy this example
Use a .NET console or API project with SQL Server LocalDB. Run dotnet run after pasting.
// same tx as update
await updateCmd.ExecuteNonQueryAsync(ct);
auditCmd.CommandText = @"INSERT INTO PriceAudit(Sku, OldPrice, NewPrice, Actor, AtUtc)
VALUES (@Sku,@Old,@New,@Actor,SYSUTCDATETIME())";
await auditCmd.ExecuteNonQueryAsync(ct);
await tx.CommitAsync(ct);What happened?
- Audit insert shares the transaction.
- Actor from authenticated user.
- Don’t audit only in C# memory.
Practice next
- Create PriceAudit.
- Write update+audit in one tx.
- Query audit by Sku.
- Add reason column.
- Index Sku, AtUtc.
Remember
Same tx as change. Who/when/what. Append-only.
ShopNest price audit
Merchandiser price edits leave audit rows.
Outcome: Disputes have a timeline.
Interview prep for this lesson
Practice these questions aloud after reading—each links to a full structured answer.
Sign in to ask a question or upvote helpful answers.
No questions yet — be the first to ask!
