How to use LINQ to find employees with duplicate names?

Short answer: How to use LINQ to find employees with duplicate names? var duplicates = employees .GroupBy(e => e.Name) .Where(g => g.Count() > 1) .Select(g => g.Key); foreach (var name in duplicates) Console.WriteLine(name); How to use LINQ to find employees with duplicate names?

Real-world example (ShopNest)

ShopNest uses LINQ to query orders: filter by date, project to a summary DTO, and order by total—readable C# that becomes SQL under EF Core.

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.