internal void clearAll()
{
TextBoxFirstName.Clear();
TextBoxLastName.Clear();
TextBoxIDNumber.Clear();
ComboBoxGender.ResetText();
TextBoxContactNumber.Clear();
TextBoxEmailAddress.Clear();
TextBoxAddressLine1.Clear();
TextBoxSuburb.Clear();
TextBoxCity.Clear();
TextBoxZipCode.Clear();
DateAdmission.ResetText();
ComboBoxCentre.ResetText();
}
/// <summary>
/// Leert und sperrt die TextBoxen
/// </summary>
private void ResetAddressDisplayArea()
{
_suspressUpdate = true;
LabelAddressID.Content = "";
TextBoxAddressLine1.Clear();
TextBoxAddressLine2.Clear();
TextBoxCity.Clear();
TextBoxPostalCode.Clear();
TextBoxAddressLine1.IsEnabled = false;
TextBoxAddressLine2.IsEnabled = false;
TextBoxCity.IsEnabled = false;
TextBoxPostalCode.IsEnabled = false;
_suspressUpdate = false;
}