OCP

PhoneFactory.cs

public class PhoneFactory
{
    public void MakePhone(Phone phone)
    {
        switch (phone.Type)
        {
            case PhoneType.Iphone:
                MakeIphone((Iphone)phone);
                break;
            case PhoneType.Samsung:
                MakeSamsung((Samsung)phone);
                break;
        }
    }
    private void MakeIphone(Phone phone)
    {
        Console.WriteLine("Iphone Created\n");
    }
    private void MakeSamsung(Phone phone)
    {
        Console.WriteLine("Samsung Created\n");
    }
}