public static void objectsForOtherClassesInSameNameSpace() { Console.WriteLine("objectsForOtherClassesInSameNameSpace Method: "); Console.WriteLine("Uses Introduce method in Person class- "); //CREATE OBJECT FOR PERSON Person john = new Person() { Age = 20 }; john.FirstName = "John"; john.LastName = "Smith"; john.Introduce(); Console.WriteLine("John is currently {0} years old", john.Age); //calling incrementAge and MakeOld methods in Person class john.IncrementAge(john.Age); john.MakeOld(john); Console.WriteLine(); Console.WriteLine("Uses Add method in Calculator class located in another folder of HelloWorld namespace- "); Calculator calculator = new Calculator(); int result = calculator.Add(1, 2); Console.WriteLine(result); }