Vehicle.cs

/// <summary>
/// The 'AbstractFactory' interface. 
/// </summary>
interface VehicleFactory
{
    Bike GetBike(string Bike);
    Scooter GetScooter(string Scooter);
}

/// <summary>
/// The 'ConcreteFactory1' class.
/// </summary>
class HondaFactory : VehicleFactory
{
    public Bike GetBike(string Bike)
    {
        switch (Bike)
        {
            case "Sports":
                return new SportsBike();
            case "Regular":
                return new RegularBike();
            default:
                throw new ApplicationException(string.Format("Vehicle '{0}' cannot be created", Bike));
        }

    }

    public Scooter GetScooter(string Scooter)
    {
        switch (Scooter)
        {
            case "Sports":
                return new Scooty();
            case "Regular":
                return new RegularScooter();
            default:
                throw new ApplicationException(string.Format("Vehicle '{0}' cannot be created", Scooter));
        }

    }
}

/// <summary>
/// The 'ConcreteFactory2' class.
/// </summary>
class HeroFactory : VehicleFactory
{
    public Bike GetBike(string Bike)
    {
        switch (Bike)
        {
            case "Sports":
                return new SportsBike();
            case "Regular":
                return new RegularBike();
            default:
                throw new ApplicationException(string.Format("Vehicle '{0}' cannot be created", Bike));
        }

    }

    public Scooter GetScooter(string Scooter)
    {
        switch (Scooter)
        {
            case "Sports":
                return new Scooty();
            case "Regular":
                return new RegularScooter();
            default:
                throw new ApplicationException(string.Format("Vehicle '{0}' cannot be created", Scooter));
        }

    }
}

/// <summary>
/// The 'AbstractProductA' interface
/// </summary>
interface Bike
{
    string Name();
}

/// <summary>
/// The 'AbstractProductB' interface
/// </summary>
interface Scooter
{
    string Name();
}

/// <summary>
/// The 'ProductA1' class
/// </summary>
class RegularBike : Bike
{
    public string Name()
    {
        return "Regular Bike- Name";
    }
}

/// <summary>
/// The 'ProductA2' class
/// </summary>
class SportsBike : Bike
{
    public string Name()
    {
        return "Sports Bike- Name";
    }
}

/// <summary>
/// The 'ProductB1' class
/// </summary>
class RegularScooter : Scooter
{
    public string Name()
    {
        return "Regular Scooter- Name";
    }
}

/// <summary>
/// The 'ProductB2' class
/// </summary>
class Scooty : Scooter
{
    public string Name()
    {
        return "Scooty- Name";
    }
}

/// <summary>
/// The 'Client' class 
/// </summary>
class VehicleClient
{
    Bike bike;
    Scooter scooter;

    public VehicleClient(VehicleFactory factory, string type)
    {
        bike = factory.GetBike(type);
        scooter = factory.GetScooter(type);
    }

    public string GetBikeName()
    {
        return bike.Name();
    }

    public string GetScooterName()
    {
        return scooter.Name();
    }

}

/// <summary>
/// Abstract Factory Pattern Demo
/// </summary>
class Program
{
    static void Main(string[] args)
    {
        VehicleFactory honda = new HondaFactory();
        VehicleClient hondaclient = new VehicleClient(honda, "Regular");

        Console.WriteLine("******* Honda **********");
        Console.WriteLine(hondaclient.GetBikeName());
        Console.WriteLine(hondaclient.GetScooterName());

        hondaclient = new VehicleClient(honda, "Sports");
        Console.WriteLine(hondaclient.GetBikeName());
        Console.WriteLine(hondaclient.GetScooterName());

        VehicleFactory hero = new HeroFactory();
        VehicleClient heroclient = new VehicleClient(hero, "Regular");

        Console.WriteLine("******* Hero **********");
        Console.WriteLine(heroclient.GetBikeName());
        Console.WriteLine(heroclient.GetScooterName());

        heroclient = new VehicleClient(hero, "Sports");
        Console.WriteLine(heroclient.GetBikeName());
        Console.WriteLine(heroclient.GetScooterName());

        Console.ReadKey();
    }
}