private void button1_Click(object sender, EventArgs e)
        {
            Classes.Bus bus  = new Classes.Bus();
            DataTable   data = new DataTable();

            data = bus.GetPessangers(txtBusNo.Text);
            dataGridView1.DataSource = data;
        }
        private void PessengerListForm_Load(object sender, EventArgs e)
        {
            Classes.Bus bus  = new Classes.Bus();
            DataTable   data = new DataTable();

            data = bus.GetPessangers(txtBusNo.Text);
            dataGridView1.DataSource = data;
            txtBusNo.Text            = _busNo;
            button1.PerformClick();
        }