private void grdGiaoVien_DoubleClick(object sender, EventArgs e)
{
cBGG_CongViecGiaoVien cbCongViec = new cBGG_CongViecGiaoVien();
int ID = int.Parse(grvGiaoVien.GetDataRow(grvGiaoVien.FocusedRowHandle)["NS_GiaoVienID"].ToString());
dlgChiTietGioGiang dlg = new dlgChiTietGioGiang(oBGiaoVien.ChiTietGioGiang(ID, Program.IDNamHoc), cbCongViec.Get(ID, Program.IDNamHoc));
dlg.ShowDialog();
}