What is the difference between a strongly typed and a loosely typed DataSet?

Short answer: Strongly Typed DataSet: A DataSet that is generated from an XSD (XML Schema Definition) file, which defines the structure of the data (tables, columns, relationships).

Explain a bit more

It provides type safety and compile-time checking. Loosely Typed DataSet: A DataSet that does not have predefined schemas, meaning you access tables and columns by name at runtime. This offers flexibility but no compile-time checking. Example: Strongly Typed: You get intellisense and type safety when accessing columns. Loosely Typed: You need to access tables and columns by name as strings, without intellisense.

Real-world example (ShopNest)

For large order exports, ShopNest uses SqlDataReader (forward-only, fast). DataSet is heavier and mainly for disconnected editing scenarios.

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.