How to flatten a dictionary of lists into a single sequence?

Short answer: { {"IT", new List<string> {"Bob", "Alice"}}, {"HR", new List<string> {"Eva", "John"}} }; foreach (var name in allEmployees) Console.WriteLine(name); var dict = new Dictionary<string, List<string>>

Example code

var allEmployees = dict.SelectMany(kvp => kvp.Value);

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.