public DataTable LoadClassByGrade(string makhoi)
{
DataTable dtKhoi;
dtKhoi = nienKhoaBUS.GetClassByYear(cbKhoaHoc.SelectedValue.ToString(), makhoi);
return(dtKhoi);
}
private void cbKhoaHoc_SelectedIndexChanged(object sender, EventArgs e)
{
getcbKhoaHoc("", cbKhoaHoc.SelectedItem.ToString(), "");
removeAllNode();
string idYear = cbKhoaHoc.SelectedValue.ToString();
var dtKhoi10 = nienKhoaBUS.GetClassByYear(idYear, "1");
addRowsToNode(dtKhoi10, 0);
//Khoi 11
var dtKhoi11 = nienKhoaBUS.GetClassByYear(idYear, "2");
addRowsToNode(dtKhoi11, 1);
//Khoi 12
var dtKhoi12 = nienKhoaBUS.GetClassByYear(idYear, "3");
addRowsToNode(dtKhoi12, 2);
tvDanhSachLop.ExpandAll();
}