Tutorials ADO.NET Core Tutorial
SQL Transactions — Complete Guide
SQL Transactions — 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 31 of 100
SQL Transactions
Foundations ✓ → SQL & safety → Production → Projects
SQL & safety · 2 — Procs, tx, performance · ~6 min · Module 4: Transactions and Error Handling
What is this?
SqlTransaction groups commands so CommitAsync persists all or RollbackAsync undoes all.
Why should you care?
ShopNest debit+credit must never leave a half update.
See it live — copy this example
Use a .NET console or API project with SQL Server LocalDB. Run dotnet run after pasting.
await using var tx = (SqlTransaction)await conn.BeginTransactionAsync(ct);
debit.Transaction = tx; credit.Transaction = tx;
try {
await debit.ExecuteNonQueryAsync(ct);
await credit.ExecuteNonQueryAsync(ct);
await tx.CommitAsync(ct);
} catch {
await tx.RollbackAsync(ct);
throw;
}What happened?
- Assign Transaction on every command.
- Keep short.
- Don’t call HTTP inside an open transaction.
Practice next
- Two updates one tx.
- Fail second → rollback first.
- Default isolation ReadCommitted.
- Three statements in one tx.
- Nested try carefully.
Remember
Begin/commit/rollback. Same tx on commands. Keep short.
ShopNest wallet transfer
Debit+credit in one SqlTransaction.
Outcome: Balances always consistent.
Interview prep for this lesson
Practice these questions aloud after reading—each links to a full structured answer.
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