void ThemMoi()
        {
            DataRow row = TVctrl.NewRow();

            row["MaTV"]          = "";
            row["NgayTV"]        = dtpNgayTV.Value.Date;
            row["MaSoKU"]        = "";
            row["SoTienThu"]     = 0;
            row["SoTienGoc"]     = 0;
            row["SoTienConLai"]  = 0;
            row["MaLoaiChungTu"] = "LCT02";
            row["TaiKhoanNo"]    = null;
            row["TaiKhoanCo"]    = null;


            TVctrl.Add(row);
            ThuVonController ctrlthuvon = new ThuVonController();

            if (ctrlthuvon.LayThuVon(txtSoButToan.Text) != null)
            {
                MessageBox.Show("Mã thu vốn này đã tồn tại !", "Thu Von", MessageBoxButtons.OK, MessageBoxIcon.Error);
                return;
            }

            if (ThamSo.LaSoNguyen(txtSoButToan.Text))
            {
                long so = Convert.ToInt64(txtSoButToan.Text);
                if (so >= ThamSo.LayMaTV())
                {
                    ThamSo.GanMaTNTL(so + 1);
                }
            }
        }
 public frmThuVon(ThuVonController ctrltv)
     : this()
 {
     this.TVctrl = ctrltv;
     status      = ThamSo.Controll.Normal;
 }