private void Search(string searchedWord)
{
searchedWord = searchedWord.ToLower();
int wordLength = searchedWord.Length;
// CurrentPatients = new ObservableCollection<PatientViewModel>(PatientsList.Where(item => item.Name.ToLower().Contains(searchedWord)));
CurrentPatients = new ObservableCollection <LocalPatient>(PatientsList.Where(item => (item.Name != null && item.Name.Length >= wordLength && item.Name.ToLower().Substring(0, wordLength) == searchedWord) ||
item.Surname != null && item.Surname.Length >= wordLength && item.Surname.ToLower().Substring(0, wordLength) == searchedWord));
SelectedPatient = CurrentPatients.FirstOrDefault();
}