How can you convert a collection to a different type using LINQ?

Short answer: Use methods like ToList(), ToArray(), or ToDictionary() to convert LINQ query results to different collection types.

Explain a bit more

Examples: var numbers = new int[] { 1, 2, 3, 4, 5 }; // Convert to List<int> List<int> numberList = numbers.ToList(); // Convert to array int[] numberArray = numberList.ToArray(); // Convert to dictionary (key = number, value = square) Dictionary<int, int> numberDict = numbers.ToDictionary(n => n, n => n * n); 📘 C# Thread-Safe Collections – Interview Questions & Answers

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.