using System;

​

public class Program

{

    public static void Main()

    {

        Text text = new Text();

        //Upcasting

        Shape shape1 = text;

        text.Height = 100;

        shape1.Height = 120;

        shape1.Draw();

        //Upcasting End 

        //Downcasting

        Shape s1 = new Text();

        Text t1 = (Text)s1;

        Text t2 = s1 as Text; //This is better

        //Console.WriteLine(s1.FontName); You cannot do this.

        t1.FontName = "Arial";

        Console.WriteLine(t1.FontName);

        //Downcasting End

    }

​

    public class Shape

    {

        public int Width

        {

            get;

            set;

        }

​

        public int Height

        {

            get;

            set;

        }

​

        public int XPos

        {

            get;

            set;

        }

​

        public int YPos

        {

            get;

            set;

        }

​

        public void Draw()

        {

            Console.WriteLine("Drawing from {0} and {1} of Width {2} and Height {3}", Width, Height, XPos, YPos);

        }

    }

​

    public class Text : Shape

    {

        public string FontSize

        {

            get;

            set;

        }

​

        public string FontName

        {

            get;

            set;

        }

    }

}