Facade Design Pattern

class Buy_Mobile_Phones
{
 public void Mobile_Phones_Categories()
 {
 Console.WriteLine("Buy_Mobile_Phones - Mobile_Phones_Categories");
 }
}
class Buy_Home_Appliances
{
 public void Home_Appliances_Categories()
 {
 Console.WriteLine("Buy_Home_Appliances - Home_Appliances_Categories ");
 }
}
 
class Buy_Animals
{
 public void Animals_Categories()
 {
 Console.WriteLine("Buy_Animals - Animals_Category");
 }
}
 
class Buy_Laptops
{
 public void Laptops_Categories()
 {
 Console.WriteLine("Buy_Laptops - Laptops_Category ");
 }
}
 
public class Online_Shopping_Website
{
 Buy_Mobile_Phones buy_mob;
 Buy_Home_Appliances buy_home_app;
 Buy_Animals buy_animals;
 Buy_Laptops buy_latops;
 
 public Online_Shopping_Website()
 {
 buy_mob= new Buy_Mobile_Phones();
 buy_home_app = new Buy_Home_Appliances();
 buy_animals = new Buy_Animals();
 buy_latops = new Buy_Laptops();
 }
 
 public void Display_Online_Shopping()
 {
 Console.WriteLine("******** Display Categories **********\n");
 buy_mob.Mobile_Phones_Categories();
 buy_home_app.Home_Appliances_Categories();
 buy_animals.Animals_Categories();
 buy_latops.Laptops_Categories();
 
 Console.WriteLine("");
 }
}
 
class Program
{
 static void Main(string[] args)
 {
 Online_Shopping_Website online_shopping_website = new Online_Shopping_Website();
 
 online_shopping_website.Display_Online_Shopping();
 
 Console.ReadKey();
 
 }
}