private void button10_Click(object sender, EventArgs e)
        {
            addBooking form = new addBooking(mc, Model);

            form.Dock = DockStyle.Fill;
            form.Show();
        }
        private void bookRoom_btn_Click(object sender, EventArgs e)
        {
            var form = new addBooking(mc, Model);

            this.Hide();
            form.Dock = DockStyle.Fill;
            form.Show();
        }