private void login_button_Click(object sender, RoutedEventArgs e)
{
NavigationService nav;
LoginItselfPage CP = new LoginItselfPage();
nav = NavigationService.GetNavigationService(this);
nav.Navigate(CP);
}
private void newaccount_button_Click(object sender, RoutedEventArgs e)
{
string s = null;
NavigationService nav;
LoginItselfPage CP = new LoginItselfPage(s);
nav = NavigationService.GetNavigationService(this);
nav.Navigate(CP);
}