static void Main(string[] args)
{
CustomerManager customerManager = new CustomerManager();
customerManager.List();
Product product = new Product {
Id = 1, Name = "Laptop"
};
Product product2 = new Product();
Product product3 = new Product(2, "Laptop");
EmployeeManager employeeManager = new EmployeeManager(new DatabaseLogger());
employeeManager.Add();
EmployeeManager employeeManager2 = new EmployeeManager(new FileLogger());
employeeManager2.Add();
PersonManager personManager = new PersonManager("Product");
personManager.Add();
Teacher.Number = 10;
Utilities.Validate();
Manager.DoSmt();
Manager manager = new Manager();
manager.DoSmt2();
Console.ReadLine();
}