Explain the differences between optimistic and pessimistic

Short answer: concurrency in ADO.NET. Optimistic Concurrency: Assumes that data conflicts are rare. It allows multiple users to read and modify the data without locking the record. However, when updating, it checks if the data has been modified by another user since it was last read. Pessimistic Concurrency: Locks the data when it's being read or modified, preventing other users from accessing it until the transaction is…

Explain a bit more

complete. It can reduce conflicts but may result in performance issues.

Real-world example (ShopNest)

ShopNest’s reporting job still uses ADO.NET for a heavy SQL query where raw performance and stored procedures matter more than EF convenience.

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.