using System;

​

public class AuditTrail

{

    public void Record() 

    {

        Console.WriteLine("Audit record");

    }

}

​

public abstract class Task

{

    private AuditTrail auditTrail;

    public Task(AuditTrail auditTrail)

    {

        this.auditTrail = auditTrail;

    }

    public void Execute() 

    {

        auditTrail.Record();

        DoExecute();

    }

    protected abstract void DoExecute();

}

​

public class TransferMoneyTask: Task

{

    public TransferMoneyTask(AuditTrail auditTrail): base(auditTrail)

    {

    }

    protected override void DoExecute()

    {

        Console.WriteLine("Transfer money");

    }

}

​

public class GenerateReportTask: Task

{

    public GenerateReportTask(AuditTrail auditTrail): base(auditTrail)

    {

    }

    protected override void DoExecute()

    {

        Console.WriteLine("Generate Report");

    }

}

​

public class Program

{

    public static void Main()

    {

        var auditTrail = new AuditTrail();

        var transferMoney = new TransferMoneyTask(auditTrail);

        transferMoney.Execute();

        var generateReport = new GenerateReportTask(auditTrail);

        generateReport.Execute();

    }

}