Фабричный метод (Ractory Menthod)

using System;

class Program
{
   static void Main(string[] args)
   {
        Developer dev = new PanelDeveloper("000 КирпичСтрой");
        House house1 = dev.Create();

        dev = new WoodDeveloper("Частный застройщик");
        House house2 = dev.Create();

        Console.ReadLine();
   }
}

abstract class Developer
{
    public string Name {get;set;}

    public Developer(string n)
    {
        this.Name = n;
    }

    abstract public House Create();
}

class PanelDeveloper: Developer
{
    public PanelDeveloper(string n): base(n){}

    public override House Create()
    {
        return new PanelHouse();
    }
}

class WoodDeveloper: Developer
{
    public WoodDeveloper(string n): base(n){}

    public override House Create()
    {
        return new WoodHouse();
    }
}

abstract class House{}

class PanelHouse: House
{
    public PanelHouse()
    {
        Console.WriteLine("Панельный дом построен");
    }
}

class WoodHouse: House
{
    public WoodHouse()
    {
        Console.WriteLine("Деревянный дом построен");
    }
}