private void ShowPasswordWindow()
{
PasswordViewModel passwordViewModel = new PasswordViewModel();
string enteredPassword = dialogService.OpenPasswordDialog(passwordViewModel);
if (password.CheckPassword(enteredPassword))
{
IsSingIn = true;
}
else if (enteredPassword == null)
{
}
else
{
MessageBox.Show("Неправельный пароль!");
ShowPasswordWindow();
}
}