How to use LINQ to check if all employees belong to a department?

Short answer: bool allInIT = employees.All(e => e.Department == "IT"); bool allInIT = employees.All(e => e.Department == "IT"); bool allInIT = employees.All(e => e.Department == "IT"); bool allInIT = employees.All(e => e.Department == "IT"); bool allInIT = employees.All(e => e.Department == "IT"); bool allInIT = employees.All(e => e.Department == "IT"); bool allInIT = employees.All(e => e.Department == "IT"); bool allInIT =…

Explain a bit more

employees.All(e => e.Department == "IT");

Example code

bool allInIT = employees.All(e => e.Department == "IT"); bool allInIT = employees.All(e => e.Department == "IT"); bool allInIT = employees.All(e => e.Department == "IT"); bool allInIT = employees.All(e => e.Department == "IT"); bool allInIT = employees.All(e => e.Department == "IT"); bool allInIT = employees.All(e => e.Department == "IT"); bool allInIT = employees.All(e => e.Department == "IT"); bool allInIT = employees.All(e => e.Department == "IT");

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.