How do you add elements to a collection using LINQ in C#?

Short answer: LINQ itself doesn’t modify collections directly but produces new collections based on queries. You typically combine LINQ with collection methods to add elements, for example: var evenNumbers = new List<int> { 2, 4, 6 };

Example code

var allNumbers = new List<int> { 1, 2, 3, 4, 5, 6 };
var combined = allNumbers.Where(n => n % 2 == 0).ToList(); // Filters even numbers If you want to add LINQ results to a collection:
List<int> filteredNumbers = allNumbers.Where(n => n % 2 == 0).ToList();

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.