WCF newbie, method not exposed.

Hi

I'm learning WCF. I have a class HelloWorldService.cs hosted by ASP.NET Dev Server and have created an interface for this. I consume the Service using a console app. Works fine with the first "Hello World" method GetMessage, however when I add a second method AddTwoNames, it just refuses to appear anywhere. Tried updating the Service Reference, removing it, even rebooting. Where am I going wrong please?

Thanks.

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

namespace MyWCFServices
{
	public class HelloWorldService: IHelloWorldService
	{
		public string GetMessage(string name)
		{
			return "Hello from " + name + "!";
		}
		public string AddTwoNames(string firstname, string lastname)
		{
			string fullname = string.Empty;
			fullname = firstname + " " + lastname;
			fullname.ToUpper();
			return fullname;
		}

	}
}


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

namespace MyWCFServices
{
	[ServiceContract]
	public interface IHelloWorldService
	{
		[OperationContract]
		string GetMessage(string name);
		string AddTwoNames(string firstname, string lastname);
	}
}

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