//laod danh sách môn học vào datagridview
public void LoadDanhSachMonHocToDatagridview()
{
string mmh = cboChonNganh_MH.SelectedValue.ToString();
dgvDanhSachMonHoc.DataSource = monHocService.GetMonHocByNganh(mmh);
CountRowsMonHoc();
}
//laod môn học vạo combobox
public void LoadMonHocToCbo()
{
cboChonMonHoc_TKB.ResetText();
cboChonMonHoc_TKB.DataSource = monHocService.GetMonHocByNganh(cboChonNganh_TKB.SelectedValue.ToString()).ToList();
cboChonMonHoc_TKB.DisplayMember = "TenMonHoc";
cboChonMonHoc_TKB.ValueMember = "MaMonHoc";
}