// GET: api/Client/pepe public IEnumerable <ClientInformation> Get(string clientName, string possiblyStolen = null) { var rep = new ClientInformationRepository(); bool?possiblyStolenArgument = string.IsNullOrEmpty(possiblyStolen) || !bool.Parse(possiblyStolen) ? (bool?)null : true; return(rep.GetClientsBy(clientName, possiblyStolenArgument)); }