I' m beginner programmer and i need some information. how can i prevent edit parameters by browser bar?. Look at the code. In my Controller i have below metod.

```
[HttpGet]
public ActionResult WypelnijFormularz(int doctor, string date, string hour, string minute)
{
    RegisterVisitModel model = new RegisterVisitModel();
    model.doctor = DoctorRepository.GetDoctorByID(doctor);
    model.dateVisit = DateTime.ParseExact(date+" "+hour+":"+minute+":00", "yyyy-MM-dd HH:mm:ss", null);

    return View(model);
}

```

parameters are sended from here:

```
button.url = "/Dentist/WypelnijFormularz?doctor=" + doctor + "&date=" + button.start.Date.ToString("d") + "&hour=" + button.start.ToString("HH") + "&minute=" + button.start.ToString("mm");

```

Code above is a one of the many properties which have Fullcalendar. Yes, Im usign Fullcalendar plugin to display events in the Week!(its a calendar hours!). After choosing the free term we are directed to methods above. The core of the problem is the fact that we can change the date in the browser and then we can book an existing appointment. How can I prevent this ??

I found website where we cant do that -> <https://www.osoz.pl/osoz-www/lekarze/potwierdzenieRejestracji?ntrz=4295&nswd=901870&data=2015-01-23&czasOd=10:50&czasDo=11:00&platnik=0&charakterPracy=OSOZ&isGWR=false&kre8=0010&nrjd=1&s=2503261200>
when you change the date, we are aware that this page does not exist. How can i got thiss.

Greetings!