static void Main(string[] args) { Console.WriteLine("The Decorator"); Console.Write("This program show to you 2 example.\n1. Coffee\n2. Text to lower\nSelect you example: "); var example = Console.ReadLine(); Console.WriteLine(); if (example == "1") { Beverage espresso = new Espresso(); espresso.DisplayCost(); Beverage darkRoast = new DarkRoast(); darkRoast = new Mocha(darkRoast); darkRoast = new Mocha(darkRoast); darkRoast = new Whip(darkRoast); darkRoast.DisplayCost(); Beverage houseBland = new HouseBland(); houseBland = new Soy(houseBland); houseBland = new Mocha(houseBland); houseBland = new Whip(houseBland); houseBland.DisplayCost(); } else { Console.Write("Write your path to text file: "); var filepath = Console.ReadLine(); try { using (LowerCaseInputStream reader = new LowerCaseInputStream(filepath)) { while (true) { var line = reader.ReadLine(); if (line == null) { break; } Console.WriteLine(line); // Use line. } } } catch (FileNotFoundException e) { Console.WriteLine(e.Message); } } }