Concrete Collection Classes
ArrayList class: This works by maintaining an internal array of objects that is replaced with a larger array when it reaches its capacity of elements.
BitArray class: It is a dynamically sized array of Boolean values. It is more memory-efficient than a simple array of bools because it uses only one bit for each value.
Hashtable class : A Hashtable is a standard dictionary (key/value) data structure that uses a hashing algorithm to store and index values efficiently.
Queue class : A Queue is a standard first-in, first-out (FIFO) data structure, providing simple operations to enqueue, dequeue, peek, etc.
SortedList class :A SortedList is a standard dictionary data structure that uses a binary-chop search to index efficiently.
Stack class : A Stack is a standard last-in first-out (LIFO) data structure.
StringCollection class: A StringCollection is a standard collection data structure for storing strings.