static void Main(string[] args) { UserControl usercontrol = new UserControl(); Person namesList = new Person(); People people = new People(); DateTime t = DateTime.Now; people.Add("Vlad", new Person("Vlad", 28)); people.Add("Alina", new Person("Alina", 24)); people.Add("Ivan", new Person("Ivan", 31)); people.Add("Luda", new Person("Ludmila", 21)); people.Add("Piter", new Person("Piter", 31)); bool isExit = false; string input; Instruction(); while (!isExit) { input = Console.ReadLine(); Enum.TryParse(input, true, out usercontrol); switch (usercontrol) { case UserControl.Exercise1: Console.WriteLine("Solve of {0}", UserControl.Exercise1); Exercise1 exercise1 = new Exercise1(); exercise1.Show(); Console.WriteLine(namesList["Vlad"].Name); foreach (DictionaryEntry personEntry in people) { Console.WriteLine("Person {0} ({1} years old)", ((Person)personEntry.Value).Name, ((Person)personEntry.Value).Age); } break; case UserControl.Exercise2: Console.WriteLine("Solve of {0}", UserControl.Exercise2); Exercise2 exercise2 = new Exercise2(); exercise2.Show(); Console.WriteLine("{0} older then {1}: {2}", namesList["Vlad"].Name, namesList["Alina"].Name, namesList["Vlad"] > namesList["Alina"]); break; case UserControl.Exercise3: Console.WriteLine("Solve of {0}", UserControl.Exercise3); Exercise3 exercise3 = new Exercise3(); exercise3.Show(); people.GetOldest(); break; case UserControl.Exercise4: Console.WriteLine("Solve of {0}", UserControl.Exercise4); Exercise4 exercise4 = new Exercise4(); exercise4.Show(); People people1 = new People(); People people2 = (People)people1.Clone(); people1 = people; Console.WriteLine("Old People class instance {0},\nNew People class instance {1}", people1.ToString(), people2.ToString()); break; case UserControl.Exercise5: Console.WriteLine("Solve of {0}", UserControl.Exercise5); Exercise5 exercise5 = new Exercise5(); exercise5.Show(); foreach (int age in people.Ages) { Console.WriteLine(age); } break; case UserControl.Exit: isExit = true; break; default: Instruction(); break; } } }