private void LoadSinhVien()
        {
            if (pDM_LopInfo == null)
            {
                return;
            }
            if (dtDanhSach.Rows.Count > 0)
            {
                arrDaDangKy = new string[dtDanhSach.Rows.Count];
                for (int i = 0; i < dtDanhSach.Rows.Count; i++)
                {
                    arrDaDangKy[i] = dtDanhSach.Rows[i]["IDSV_SinhVien"].ToString();
                }
                strDaDangKy = String.Join(",", arrDaDangKy);
            }
            else
            {
                strDaDangKy = "0";
            }

            if (xtraTabControl1.SelectedTabPage.Name == "tabThemTuDanhSachDuThi")
            {
                layoutThemThiSinhTuDo.Visibility = DevExpress.XtraLayout.Utils.LayoutVisibility.Never;
                dtDuThi = oBSV_SinhVien.GetDanhSachDuThiTotNghiep_ToChucThi(pDM_LopInfo, Program.NamHoc, Program.IDNamHoc, strDaDangKy);
                oBSV_SinhVien.TachCotHoVaTen(ref dtDuThi);
                grdSinhVienDuThi.DataSource = dtDuThi;
            }
            else if (xtraTabControl1.SelectedTabPage.Name == "tabThemTuLop")
            {
                layoutThemThiSinhTuDo.Visibility = DevExpress.XtraLayout.Utils.LayoutVisibility.Never;
                dtDuThi = oBSV_SinhVien.GetDanhSach_ToChucThi(pDM_LopInfo, Program.NamHoc, strDaDangKy);
                oBSV_SinhVien.TachCotHoVaTen(ref dtDuThi);
                grdSinhVien.DataSource = dtDuThi;
            }
            else if (xtraTabControl1.SelectedTabPage.Name == "tabThiLaiTotNghep")
            {
                layoutThemThiSinhTuDo.Visibility = DevExpress.XtraLayout.Utils.LayoutVisibility.Never;
                dtDuThi = oBSV_SinhVien.GetDanhSachDuThiKhoaTruoc(IDDM_MonHoc, Program.IDNamHoc, Program.HocKy, LanThi, strDaDangKy);
                oBSV_SinhVien.TachCotHoVaTen(ref dtDuThi);
                grdTotNghiep.DataSource = dtDuThi;
            }
            else
            {
                layoutThemThiSinhTuDo.Visibility = DevExpress.XtraLayout.Utils.LayoutVisibility.Always;
                dtDuThi = oBSV_SinhVien.GetThiSinhTuDo(pDM_LopInfo, Program.NamHoc, Program.IDNamHoc, strDaDangKy);
                oBSV_SinhVien.TachCotHoVaTen(ref dtDuThi);
                grdThiSinhTuDo.DataSource = dtDuThi;
            }
        }