Tutorials ADO.NET Core Tutorial
Retry Logic — Complete Guide
Retry Logic — 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 35 of 100
Retry Logic
Foundations ✓ → SQL & safety → Production → Projects
SQL & safety · 2 — Procs, tx, performance · ~6 min · Module 4: Transactions and Error Handling
What is this?
Retry transient SQL errors (timeouts, deadlocks, failover) with backoff and idempotent commands.
Why should you care?
ShopNest Azure SQL failovers should not fail the first blip.
See it live — copy this example
Use a .NET console or API project with SQL Server LocalDB. Run dotnet run after pasting.
bool Transient(SqlException ex) =>
ex.Number is 1205 or -2 or 40613 or 40197;
// retry loop when Transient(ex)What happened?
- Only transient codes.
- Idempotency keys for writes.
- Polly is fine for production policies.
Practice next
- List transient numbers.
- Wrap Execute in retry.
- Don’t retry unique key violations.
- Simulate -2 timeout in lab.
- Cap attempts at 5.
Remember
Transient only. Backoff + jitter. Idempotent writes.
ShopNest SQL resilience
Repo retries transient Azure errors.
Outcome: Blips self-heal.
Interview prep for this lesson
Practice these questions aloud after reading—each links to a full structured answer.
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