using System;using System.Collections.Generic;class Example{ public static void Main() {  Queue<string> numbers = new Queue<string>();  numbers.Enqueue("one");  numbers.Enqueue("two");  numbers.Enqueue("three");  numbers.Enqueue("four");  numbers.Enqueue("five");  // A queue can be enumerated without disturbing its contents.  foreach( string number in numbers )  {   Console.WriteLine(number);  }  Console.WriteLine("/nDequeuing '{0}'", numbers.Dequeue());  Console.WriteLine("Peek at next item to dequeue: {0}",    numbers.Peek());  Console.WriteLine("Dequeuing '{0}'", numbers.Dequeue());  // Create a copy of the queue, using the ToArray method and the  // constructor that accepts an IEnumerable<T>.  Queue<string> queueCopy = new Queue<string>(numbers.ToArray());  Console.WriteLine("/nContents of the first copy:");  foreach( string number in queueCopy )  {   Console.WriteLine(number);  }  // Create an array twice the size of the queue and copy the  // elements of the queue, starting at the middle of the   // array.   string[] array2 = new string[numbers.Count * 2];  numbers.CopyTo(array2, numbers.Count);  // Create a second queue, using the constructor that accepts an  // IEnumerable(Of T).  Queue<string> queueCopy2 = new Queue<string>(array2);  Console.WriteLine("/nContents of the second copy, with duplicates and nulls:");  foreach( string number in queueCopy2 )  {   Console.WriteLine(number);  }  Console.WriteLine("/nqueueCopy.Contains(/"four/") = {0}",    queueCopy.Contains("four"));  Console.WriteLine("/nqueueCopy.Clear()");  queueCopy.Clear();  Console.WriteLine("/nqueueCopy.Count = {0}", queueCopy.Count); }}/* This code example produces the following output:onetwothreefourfiveDequeuing 'one'Peek at next item to dequeue: twoDequeuing 'two'Contents of the copy:threefourfiveContents of the second copy, with duplicates and nulls:threefourfivequeueCopy.Contains("four") = TruequeueCopy.Clear()queueCopy.Count = 0 */