1     interface ICarBuilder
2     {
3         void BuilderWheels();
4         void BuilderWindows();
5     }

 1     public class BasicBuilder : ICarBuilder
 2     {
 3         public void BuilderWheels()
 4         {
 5             Console.WriteLine("Builder Basic Wheels");
 6         }
 7 
 8         public void BuilderWindows()
 9         {
10             Console.WriteLine("Builder Basic Windows");
11         }
12     }
13 
14     public class AdvancedBuilder : ICarBuilder
15     {
16         public void BuilderWheels()
17         {
18             Console.WriteLine("Builder Advanced Wheels");
19         }
20 
21         public void BuilderWindows()
22         {
23             Console.WriteLine("Builder Advanced Windows");
24         }
25     }

 1     class CarFactory
 2     {
 3         public ICarBuilder Builder { get; set; }
 4 
 5         public CarFactory(ICarBuilder builder)
 6         {
 7             Builder = builder;
 8         }
 9 
10         public void CreateCar()
11         {
12             Builder.BuilderWheels();
13             Builder.BuilderWindows();
14         }
15     }

1     static void Main(string[] args)
2     {
3         CarFactory game = new CarFactory(new BasicBuilder());
4         game.CreateCar();
5         game.Builder = new AdvancedBuilder();
6         game.CreateCar();
7         Console.ReadLine();
8     }