private void btnChuongBai_ItemClick(object sender, DevExpress.XtraBars.ItemClickEventArgs e)
{
FrmChuongBai frmCH = new FrmChuongBai();
frmCH.MdiParent = this;
frmCH.Show();
}
private void txtMaChuong_Enter(object sender, EventArgs e)
{
FrmChuongBai frmCB = new FrmChuongBai();
frmCB.idMonHoc = txtmaMonHoc.Tag.ToString();
frmCB.ShowDialog();
if (frmCB.idChuongBai != null)
{
txtMaChuong.Text = cb.getMaChuongBaiByID(frmCB.idChuongBai);
txtMaChuong.Tag = frmCB.idChuongBai;
txttenChuong.Text = cb.getTenChuongBaiByID(frmCB.idChuongBai);
}
}