What types of containers have you used in your projects?

In C# projects, I used various container types from the System.Collections and System.Collections.Generic namespaces depending on the task:

• List<T> — a dynamic array, convenient for storing ordered collections with quick access by index.
• Dictionary<TKey, TValue> — a hash table for storing key-value pairs, providing fast key-based lookup.
• HashSet<T> — a set of unique elements, useful for eliminating duplicates.
• Queue<T> and Stack<T> — data structures for FIFO and LIFO operations respectively.
• ObservableCollection<T> — a collection with change notifications, often used in MVVM for data binding.

The choice of container depends on performance requirements, the need for element uniqueness, order, and the frequency of add/remove operations.