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Performance:?

Q: Performance:?

Short answer: DataReader is faster than DataSet because it retrieves data in a streaming manner, one row at a time, without creating copies of the data. DataSet requires more processing to maintain its structure (tables, relationships) and populate in memory. 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 Define — one clear sentence (the short answer above). Example — relate it to a project like ShopNest or your real work. Trade-off — when you would not use it.

Short answer: DataReader is faster than DataSet because it retrieves data in a streaming manner, one row at a time, without creating copies of the data. DataSet requires more processing to maintain its structure (tables, relationships) and populate in memory.

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

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

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