using System;
//If any class inherits from class “B” then method – “First” will not be overridable as this method is sealed in class B.
public class Program
{
public static void Main()
Console.WriteLine("Hello World");
}
class A
protected virtual void First() { }
protected virtual void Second() { }
class B : A
sealed protected override void First() {}
protected override void Second() { }
class c:B{
protected override void First(){}