Thanks, I knew it's something stupid on my part!

Those three classes are not child classes so you do not need to override.

Looking at the code below, you are returning something?

virtual public void CalcPoints(int intMin, int intMax)
{...

What do you mean?


Label lbl=new Label();
lbl.Text="What do you mean?";
SomeContainer.Controls.Add(lbl);

Is Generics needed for this?
TIA


using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace VehicleWorld