What is the purpose of the BatchUpdate method in ADO.NET?

Short answer: The BatchUpdate method is used to send multiple SQL commands (such as insert, update, or delete) in a single round trip to the database.

Explain a bit more

This improves performance by reducing the overhead of sending multiple individual commands. While BatchUpdate isn't directly exposed as a method on the DataAdapter object, you can achieve similar functionality by manually creating a batch of commands and executing them in a single call. Example (Using SqlDataAdapter): SqlDataAdapter adapter = new SqlDataAdapter("SELECT * FROM Customers", connection); SqlCommandBuilder builder = new SqlCommandBuilder(adapter); // Automatically generates commands for Update, Insert, and Delete DataTable table = new DataTable(); adapter.Fill(table); // Modify DataTable as needed // Update changes to the database in one go (BatchUpdate) adapter.Update(table);

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.