What is a transaction in ADO.NET, and how do you manage it?

Short answer: A transaction in ADO.NET is a sequence of database operations that are executed as a single unit. If one operation fails, all previous operations are rolled back. You can manage transactions using the SqlTransaction object. Steps:

Real-world example (ShopNest)

Placing an order updates stock and inserts the order row in one SqlTransaction—either both succeed or both roll back.

Say this in the interview

1. Define — one clear sentence (the short answer above).
2. Example — relate it to a project like ShopNest or your real work.
3. Trade-off — when you would not use it.