private void button1_Click(object sender, EventArgs e)
{
string newPassword = textBox1.Text;
PasswordConfirmation pc = new PasswordConfirmation(users, login, newPassword);
pc.Show();
textBox1.Clear();
}
void ShowPasswordConfForm(string login, string password)
{
PasswordConfirmation pc = new PasswordConfirmation(users, login, password);
pc.Show();
}