using System;

​

class ParentClass

{

    public ParentClass()

    {

        Console.WriteLine("This is Parent Class.");

    }

}

​

class ChildClass: ParentClass

{

    public ChildClass()

    {

        Console.WriteLine("This is Child Class.");

    }

}

​

class NewParentClass

{

    // Default Constructor

    public NewParentClass()

    {

        Console.WriteLine("This is New Parent Class Default Constructor.");

    }

​

    // Second Constructor

    public NewParentClass(string strInput)

    {

        Console.WriteLine("This is New Parent Class Second Constructor."+ strInput);

    }

}

​

class NewChildClass : NewParentClass

{

    public NewChildClass() : base("calling from child")

    {

        Console.WriteLine("This is New Child Class.");

    }

}

​

public class Program

{

    public static void Main()

    {

        // Create Child Class

        ChildClass myClass = new ChildClass();

​

​

        // Create New Child Class

        NewChildClass myNewClass = new NewChildClass();

    }

}