using System;

​

public class BaseClass

{

    public BaseClass()

    {

        //Console.WriteLine("\nConstructor - Base Class");

    }

    public void Method1()

    {

        Console.WriteLine("Base Class Method");

    }

}

​

public class DerivedClass : BaseClass

{

    public DerivedClass()

    {

        //Console.WriteLine("\nConstructor - Derived Class");

    }

    public static void Main()

    {

        DerivedClass d = new DerivedClass();

        d.Method1();

        //BaseClass b = (BaseClass)d; //new DerivedClass();

        //((BaseClass)d).Method1();

        //b.Method1();

        BaseClass b1 = new DerivedClass();

        ((DerivedClass)b1).Method1();

        BaseClass b2 = new BaseClass();

        b2.Method1();

    }

    public new void Method1()

    {

        Console.WriteLine("Derived Class Method");      

        //base.Method1();

    }

}