void loadcombo()
{
comboBox1.DataSource = a.LoadTuyenXe();
comboBox1.DisplayMember = "TenTuyen";
comboBox1.ValueMember = "IdTuyen";
comboBox2.DataSource = a.loadxe();
comboBox2.DisplayMember = "So_Xe";
comboBox2.ValueMember = "So_Xe";
comboIdChuyn.DataSource = a.loadidchuyen();
comboIdChuyn.DisplayMember = "IdChuyen";
comboIdChuyn.ValueMember = "IdChuyen";
comboBoxIdtuyen.DataSource = a.LoadTuyenXe();
comboBoxIdtuyen.DisplayMember = "TenTuyen";
comboBoxIdtuyen.ValueMember = "IdTuyen";
comboBox3.DataSource = a.loadxe();
comboBox3.DisplayMember = "So_Xe";
comboBox3.ValueMember = "So_Xe";
comboBox4.DataSource = a.loadidchuyen();
comboBox4.DisplayMember = "IdChuyen";
comboBox4.ValueMember = "IdChuyen";
}
// int flag = 0;
public QuanLyTuyen()
{
InitializeComponent();
// comboBox1.Visible = false;
comboBox1.DataSource = b.LoadTuyenXe();
comboBox1.DisplayMember = "IdTuyen";
comboBox1.ValueMember = "IdTuyen";
comboBox2.DataSource = b.LoadTuyenXe();
comboBox2.DisplayMember = "IdTuyen";
comboBox2.ValueMember = "IdTuyen";
}