private void button2_Click(object sender, EventArgs e)
        {
            Klienci k = new Klienci("dialog");

            k.ShowDialog();
            label25.Text = k.klientID;
            dodajKlienta(int.Parse(label25.Text));
        }
        private void button6_Click(object sender, EventArgs e)
        {
            this.Hide();

            Klienci k = new Klienci("main");

            k.Show();
        }