public MainVM()
{
gotoAdp = new RelayCommand(x => CurrentView = new AddPatientVM());
gotoSrch = new RelayCommand(x => CurrentView = new SearchPatientVM());
GoToPat = new RelayCommand(x => { CurrentView = new PatientProfileVM(Convert.ToInt32(x)); previousView = new SearchPatientVM(); }, x => HelpfulMethods.Checkdata(x));
PreviousPage = new RelayCommand(x => CurrentView = previousView);
gotoApp = new RelayCommand(x => CurrentView = new AppointmentVM());
exit = new RelayCommand(x => ExitWindow(x));
}