What is a C# queue?

Commonly used methods

Method	Description
`clear()`	It removes all the elements in the queue.
`contains(object)`	It determines whether or not the object is in the queue.
`Dequeue()`	It removes the element from the start of the queue.
`Enqueue()`	It adds the object at the end of the queue.
`toArray()`	It copies the queue to a new array.
`TrimToSize()`	It sets the size of the queue according to the number of elements in the queue.

using System;
using System.Collections;
namespace CollectionsApplication {
   class Program {
      static void Main(string[] arguments) {
         Queue qu = new Queue();
         
         qu.Enqueue('E');
         qu.Enqueue('D');
         qu.Enqueue('U');
         qu.Enqueue('C');
         qu.Enqueue('A');
         qu.Enqueue('T');
         qu.Enqueue('I');
         qu.Enqueue('V');
         qu.Enqueue('E');
         
         Console.WriteLine("Current queue: ");
         foreach (char c in qu) Console.Write(c + " ");
         
         Console.WriteLine();
         qu.Enqueue('I');
         qu.Enqueue('N');
         qu.Enqueue('C');
         qu.Enqueue('.');
         Console.WriteLine("Queue after using Enqueue: ");
         foreach (char c in qu) Console.Write(c + " ");
         
         Console.WriteLine();
         
         qu.Dequeue();
         Console.WriteLine("Queue after using Dequeue: ");
         foreach (char c in qu) Console.Write(c + " ");
         
         Console.WriteLine();
         
         // Contains function.
         bool val = qu.Contains('E');
         Console.WriteLine("Check whether it contains 'E': ");
         Console.WriteLine(val);
         Console.ReadKey();
      }
   }
}

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