C# read-only calculated properties, should they be methods?

Question

I have several entities that have calculated fields on them such as TotalCost. Right now I have them all as properties but I\'m wondering if they should actually be methods. Is

Answer 1

MSDN gives information about this here

Class library designers often must decide between implementing a class member as a property or a method. In general, methods represent actions and properties represent data.

Which one do you think it is? An action calculate/getLaborCost or data?

WorkOrder workOrder = new WorkOrder();
workOrder.LaborHours = 8;
workOrder.LaborRate = 20;

decimal cost = workOrder.LaborCost; // This is OK here

but if you are going to do this for the same object also:

worOrder.LaborHours = 18;
decimal newCost = workOrder.LaborCost 

Now this cannot be a property. It would be a lot better to be a method.