private void frmCapNhatThongTinLopDangKy_Load(object sender, EventArgs e)
 {
     cbCLB.DataSource    = CLBServices.LayDanhSachCLB();
     cbCLB.DisplayMember = "TenCLB";
     cbCLB.ValueMember   = "MaCLB";
     foreach (TextBox tb in this.Controls.OfType <TextBox>())
     {
         tb.TextChanged += Tb_TextChanged;
     }
     txtHocPhi.Text      = _TTLop[2].ToString();
     txtTenLop.Text      = _TTLop[1].ToString();
     txtLichHoc.Text     = _TTLop[3].ToString();
     txtNamHoc.Text      = _TTLop[6].ToString();
     cbCLB.SelectedIndex = cbCLB.FindStringExact(_TTLop[4].ToString());
 }
 private void onload()
 {
     bdCLB.DataSource = CLBServices.LayDanhSachCLB();
 }