private void btn_Save_Click(object sender, RoutedEventArgs e)
{
ChosenPlayer.FirstName = txt_FirstName.Text;
ChosenPlayer.LastName = txt_LastName.Text;
ChosenPlayer.Email = txt_Email.Text;
ChosenPlayer.PhoneNr = txt_PhoneNr.Text;
BusinessFacade.UpdatePlayer(ChosenPlayer);
}