public IHttpActionResult AddCustomer(Orders orderadd) { orders = orderStore.getDictionary(); Boolean b = true; foreach (KeyValuePair <int, Orders> entry in orders) { if (entry.Key == orderadd.ID) { b = false; break; } } if (b == true) { orders.Add(orderadd.ID, orderadd); return(Content(HttpStatusCode.Created, orders)); } else { return(Content(HttpStatusCode.BadRequest, "Order already exists")); } orderStore.StoreDictionary(orders); }