What is the best collection to use for a specific use case in C#?

What is the best collection to use for a specific use case in C#?

It depends on your use case! Are you looking for a collection that allows fast lookups, or one that maintains order?

I need to frequently add and remove items, but also want to access them by index.

In that case, a List<T> might be a good choice. It allows for indexed access and is efficient for adding/removing items.

What if I need to ensure that all items are unique?

You should consider using a HashSet<T>. It automatically handles uniqueness and provides fast lookups.

Can you give me an example of when to use a Dictionary<TKey, TValue>?

Sure! Use a Dictionary<TKey, TValue> when you need to associate keys with values, like storing user IDs with user details.