private void btnLogin_Click(object sender, EventArgs e)
{
if (users.confirmLogin(txtUser.Text, txtPass.Text))
{
Users user = users.getUserByName(txtUser.Text);
user.Bank = cbank.getBankByUser(user.User);
SUsers.setInstance(user);
Principal principal = new Principal();
Hide();
principal.ShowDialog();
}
else
{
MessageBox.Show("there is no user with this password or user", "there is an error:");
}
}