C#

  Queue   is a special type of collection that stores the elements in FIFO style (First In First Out), exactly opposite of the   Stack<T>   collection. It contains the elements in the order they were added. C# includes generic   Queue<T>   and non-generic   Queue   collection. It is recommended to use the generic   Queue<T>   collection. Queue<T> Characteristics Queue<T>  is FIFO (First In First Out) collection. It comes under  System.Collection.Generic  namespace. Queue<T>  can contain elements of the specified type. It provides compile-time type checking and doesn't perform boxing-unboxing because it is generic. Elements can be added using the  Enqueue()  method. Cannot use collection-initializer syntax. Elements can be retrieved using the  Dequeue()  and the  Peek()  methods. It does not support an indexer. The following figure illustrates the Queue ...