How do you initialize a collection using collection initializers in C#?

Short answer: Collection initializers allow you to create and populate a collection in a concise way at the time of declaration. Example: List<int> numbers = new List<int> { 1, 2, 3, 4, 5 };

Example code

Dictionary<string, int> ages = new Dictionary<string, int>
{ { "Alice", 30 }, { "Bob", 25 } }; This syntax internally calls the collection’s Add() method for each element.

Real-world example (ShopNest)

In ShopNest checkout, choose the collection by need: List for ordered cart lines, Dictionary for fast SKU lookup, HashSet for unique tags.

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.