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What is Join in LINQ?

Updated May 16, 2026

Short answer

Join combines two sequences based on matching keys.

Deep explanation

LINQ Join performs inner join-like operations using key selectors.

Real-world example

Combining customer and order data.

Common mistakes

  • Incorrect key mapping causing empty results.

Follow-up questions

  • What is inner join?
  • Does Join preserve unmatched data?

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