private void btnOdjava_Click(object sender, EventArgs e)
        {
            Form frm = new frmLogIn();

            this.Hide();
            frm.ShowDialog();
            this.Close();
        }
        private void btnNazad_Click(object sender, EventArgs e)
        {
            Form frmLogin = new frmLogIn();

            this.Hide();
            frmLogin.ShowDialog();
            this.Close();
        }