C# | Add an object to the end of the Queue - Enqueue Operation

Last Updated : 01 Feb, 2019

Queue represents a first-in, first out collection of object. It is used when you need a first-in, first-out access of items. When you add an item in the list, it is called enqueue, and when you remove an item, it is called dequeue. Queue<T>.Enqueue(T) Method is used to add an object to the end of the Queue<T>. Properties:

Enqueue adds an element to the end of the Queue.
Dequeue removes the oldest element from the start of the Queue.
Peek returns the oldest element that is at the start of the Queue but does not remove it from the Queue.
The capacity of a Queue is the number of elements the Queue can hold.
As elements are added to a Queue, the capacity is automatically increased as required by reallocating the internal array.
Queue accepts null as a valid value for reference types and allows duplicate elements.

Syntax :

void Enqueue(object obj);

The Enqueue() method inserts values at the end of the Queue. Example:

CSHARP

// C# code to add an object
// to the end of the Queue
using System;
using System.Collections.Generic;

class GFG {

    // Driver code
    public static void Main()
    {

        // Creating a Queue of strings
        Queue<string> myQueue = new Queue<string>();

        // Inserting the elements into the Queue
        myQueue.Enqueue("one");

        // Displaying the count of elements
        // contained in the Queue
        Console.Write("Total number of elements in the Queue are : ");

        Console.WriteLine(myQueue.Count);

        myQueue.Enqueue("two");

        // Displaying the count of elements
        // contained in the Queue
        Console.Write("Total number of elements in the Queue are : ");

        Console.WriteLine(myQueue.Count);

        myQueue.Enqueue("three");

        // Displaying the count of elements
        // contained in the Queue
        Console.Write("Total number of elements in the Queue are : ");

        Console.WriteLine(myQueue.Count);

        myQueue.Enqueue("four");

        // Displaying the count of elements
        // contained in the Queue
        Console.Write("Total number of elements in the Queue are : ");

        Console.WriteLine(myQueue.Count);

        myQueue.Enqueue("five");

        // Displaying the count of elements
        // contained in the Queue
        Console.Write("Total number of elements in the Queue are : ");

        Console.WriteLine(myQueue.Count);

        myQueue.Enqueue("six");

        // Displaying the count of elements
        // contained in the Queue
        Console.Write("Total number of elements in the Queue are : ");

        Console.WriteLine(myQueue.Count);
    }
}

Output:

Total number of elements in the Queue are : 1
Total number of elements in the Queue are : 2
Total number of elements in the Queue are : 3
Total number of elements in the Queue are : 4
Total number of elements in the Queue are : 5
Total number of elements in the Queue are : 6

Reference: