System.Collections.Stack.Contains C# (CSharp) Method

        public virtual bool Contains(object obj) { throw null; }
        public virtual void CopyTo(System.Array array, int index) { }

        static void Main(string[] args)
        {
            Stack ast = new Stack();
            ast.Push("Item 1");
            ast.Push("Item 2");
            ast.Push("Item 3");
            ast.Push("Item 4");

            Console.WriteLine("Count:    {0}", ast.Count);
            PrintValues(ast);

            // Peek item but do not remove
            object item = ast.Peek();
            Console.WriteLine("Peek: {0}", item);
            PrintValues(ast);

            // Peek and cast but do not remove
            string itemString = ast.Peek() as string;   // fast cast
            Console.WriteLine("Peek: {0}", item);
            PrintValues(ast);

            // Contains
            Boolean contains = ast.Contains("Item 3");
            Console.WriteLine("Contains: {0}", contains);

            // Remove items
            object item4 = ast.Pop();
            object item3 = ast.Pop();
            Console.WriteLine("Pop: {0}  {1}", item4, item3);
            PrintValues(ast);
            Console.WriteLine("Count:    {0}", ast.Count);

            // no TrimToSize method
        }