private void btnBaiHoc_ItemClick(object sender, DevExpress.XtraBars.ItemClickEventArgs e)
{
FrmBaiHoc frmBH = new FrmBaiHoc();
frmBH.MdiParent = this;
frmBH.Show();
}
private void txtMaBaiHoc_Enter(object sender, EventArgs e)
{
FrmBaiHoc frmBH = new FrmBaiHoc();
frmBH.idChuongBai = txtMaChuong.Tag.ToString();
frmBH.ShowDialog();
if (frmBH.idBaiHoc != null)
{
txtMaBaiHoc.Text = bh.getMaBaiHocByID(frmBH.idBaiHoc);
txtMaBaiHoc.Tag = frmBH.idBaiHoc;
txtTenBaiHoc.Text = bh.getTenBaiHocByID(frmBH.idBaiHoc);
}
}