States

public class WebserviceWrapper : IWebserviceWrapper
{

public static Dictionary<string, string> States;
public readonly object _locker = new object();


public string GetStateName(string statecode)
{

	lock(_locker)
	{
			if(States.HasKey(statecode))
			return state.value;
			
			else
			States[statecode] = LookupStateName(statecode);
	}	
}

Public string LookupStateName(string statecode)
{
	var service = new StateLookupWebService();
	return service.LookupStateName(statecode);
}
}

public interface IWrapWebservice
{
	string GetStateName(string statecode)
	string LookupStateName(string statecode)
}