//[DisableCors] public ActionResult <string> Counter([FromBody] CounterModel counter) { string result = "error"; try { DevicesRepository devices = new DevicesRepository(_options); if (devices.GetDeviceBySerial(counter.Serial).Count == 0) { result = devices.InsertCounter(counter.Serial, counter.Brand, counter.Model, counter.Type); } else { result = "The serial number entered was already registered. Please check the serial number."; } } catch (Exception ex) { return("Error: " + ex.Message); } return(result); }