In the developers guide, the examples for BizRul objects all have their internal methods returning strings, as well as adding broken rules, etc.

public string ValidateShipName(string shipName)
{
	string message = null;

	if (shipName == "")
	{
		message = "Must specify a ship name";
		this.AddErrorProviderBrokenRule("ShipName",
			message);
	}
	return message;
}

My question is why does this method return a string? The message is taken care of through AddErrorProviderBrokenRule(), and I don't see anything calling this that uses the string it returns... In my own BizRule objects, I the internal validation methods are void vs string, and they appear to be working just fine...

Thanks for any input.

-Nate