static void Main(string[] args)
{
Product product1 = new Product();
product1.Id = 1;
product1.CategoryId = 2;
product1.ProductName = "Masa";
product1.UnitPrice = 500;
product1.UnitInStock = 5;
Product product2 = new Product {
Id = 2, CategoryId = 5, UnitInStock = 5,
ProductName = "Kalem", UnitPrice = 35,
};
ProductManager productManager = new ProductManager();
productManager.ADD(product1);
Console.WriteLine(product1.ProductName);
int sayi = 100;
productManager.BiseyYap(sayi);
Console.WriteLine(sayi);
}