using System;

​

// Define the base class, Car. The class defines two methods,  

// DescribeCar and ShowDetails. DescribeCar calls ShowDetails, and each derived  

// class also defines a ShowDetails method. The example tests which version of  

// ShowDetails is selected, the base class method or the derived class method.  

public class Car  

{  

    public void DescribeCar()  

    {  

        System.Console.WriteLine("Four wheels and an engine.\n");  

        ShowDetails();  

    }  

    public virtual void ShowDetails()  

    {  

        System.Console.WriteLine("Standard transportation.\n");  

    }  

}  

// Define the derived classes.  

// Class ConvertibleCar uses the new modifier to acknowledge that ShowDetails  

// hides the base class method.  

public class ConvertibleCar : Car  

{  

    public new void ShowDetails()  

    {  

        System.Console.WriteLine("A roof that opens up.\n");  

    }  

}  

// Class Minivan uses the override modifier to specify that ShowDetails  

// extends the base class method.  

public class Minivan : Car  

{  

    public override void ShowDetails()  

    {  

        System.Console.WriteLine("Carries seven people.\n");  

    }  

}  

public class Program

{

    public static void Main()

    {

        Car C1 = new Car();

        ConvertibleCar C2 = new ConvertibleCar();

        Minivan M1 = new Minivan();

        C1.DescribeCar();

        C2.DescribeCar();

        M1.DescribeCar();

    }

}