public HttpResponseMessage GetFlightByOD(string o, string d) { using (TECAirlinesDBEntities entities = new TECAirlinesDBEntities()) { var ent = entities.GET_FLIGHT_BYOD(o, d).ToList(); if (ent != null) { return(Request.CreateResponse(HttpStatusCode.OK, ent)); } else { return(Request.CreateErrorResponse(HttpStatusCode.NotFound, "EL vuelo con origen " + o + " y destino " + d + "no existe.")); } } }