C# Online Compiler | .NET Fiddle

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();
	}
}
Cached Result
606.00
10,605.00
100,495.00