1     public abstract class CarFactory
2     {
3         public abstract void CreateWindows();
4         public abstract void CreateWheels();
5     }

 1     public class BenzFactory : CarFactory
 2     {
 3         public override void CreateWindows()
 4         {
 5             Console.WriteLine("Create Benz Windows");
 6         }
 7 
 8         public override void CreateWheels()
 9         {
10             Console.WriteLine("Create Benz Wheels");
11         }
12     }
13     public class BMWFactory : CarFactory
14     {
15         public override void CreateWindows()
16         {
17             Console.WriteLine("Create BMW Windows");
18         }
19 
20         public override void CreateWheels()
21         {
22             Console.WriteLine("Create BMW Wheels");
23         }
24     }

 1     static void Main(string[] args)
 2     {
 3         CarFactory carFactory = new BenzFactory();
 4         carFactory.CreateWindows();
 5         carFactory.CreateWheels();
 6 
 7         Console.WriteLine("Change Factory To BMWFactory");
 8         carFactory = new BMWFactory();
 9         carFactory.CreateWindows();
10         carFactory.CreateWheels();
11 
12         Console.ReadLine();
13     }