using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

namespace VirtualMethods

{

class Program

{

static void Main(string[] args)

{

SqlServer sqlServer=new SqlServer();

sqlServer.Add();

MySql mySql=new MySql();

mySql.Add();

Console.ReadLine();

}

}

class Database

{

public virtual void Add()

{

Console.WriteLine("Added by default");

}

public virtual void Delete()

{

Console.WriteLine("Deleted by default");

}

}

class SqlServer:Database

{

public override void Add()

{

Console.WriteLine("Added by Sql Code");

//base.Add();

}

}

class MySql:Database

{

}

}