static void Main(string[] args) { Dequeue<string> queue = new Dequeue<string>(); queue.AddToEnd("one"); queue.AddToEnd("two"); queue.AddToEnd("three"); queue.AddToFront("zero"); Console.WriteLine(queue.PeekFromFront()); Console.WriteLine(queue.PeekFromEnd()); if (queue.Contains("one")) { Console.WriteLine(true); } }