List of most common Collections in C#

In C#, there are several common collection types provided by the .NET Framework for storing and managing groups of objects.

Some common collection types in C#, as follows

1. Array: Arrays are fixed-size collections that can store elements of the same type. They have a fixed length and cannot be resized after initialization.
2. List\: List is a dynamic array that can grow or shrink in size. It’s part of the System.Collections.Generic namespace and provides methods for adding, removing, and manipulating elements.
3. Dictionary\: Dictionary is a key-value pair collection where you can store elements based on unique keys. It’s useful for fast lookups and is also part of the System.Collections.Generic namespace.
4. HashSet\: HashSet is a collection of unique elements. It ensures that all elements are distinct and does not allow duplicates.
5. Queue\: Queue represents a first-in-first-out (FIFO) collection. Elements are removed in the order they were added.
6. Stack\: Stack represents a last-in-first-out (LIFO) collection. Elements are removed in the reverse order of their addition.
7. LinkedList\: LinkedList is a doubly-linked list that allows efficient insertion and removal of elements at both ends and at specific positions.
8. ArrayList: ArrayList is a non-generic collection that can store elements of different types. It’s not type-safe and is generally less efficient than List<T>.
9. BitArray: BitArray represents a collection of bits and allows for efficient bitwise operations.
10. SortedSet\: SortedSet is similar to HashSet, but it keeps elements in sorted order based on their natural ordering or a specified comparer.
11. SortedDictionary\: SortedDictionary is similar to Dictionary, but it keeps key-value pairs in sorted order based on their keys.
12. NameValueCollection: NameValueCollection is used to store key-value pairs where the keys can have multiple values.
13. ObservableCollection\: ObservableCollection is a specialized collection that implements the INotifyCollectionChanged interface, making it suitable for data binding in user interfaces.
14. Concurrent collections: These collections are designed for multi-threaded scenarios and include types like ConcurrentQueue, ConcurrentStack, ConcurrentBag, and ConcurrentDictionary.
15. Immutable collections: Immutable collections are collections whose contents cannot be modified after creation. They include types like ImmutableList, ImmutableDictionary, and ImmutableHashSet.
16. BlockingCollection\: BlockingCollection is used for producer-consumer scenarios in multi-threaded applications. It provides thread-safe blocking operations.
17. Specialized collections: .NET also provides specialized collections like KeyedCollection, ReadOnlyCollection, and others for specific use cases.

The choice of collection type depends on the specific requirements of the application, including

•     the type of data to store
•     the expected access patterns
•     concurrency considerations