private void GrvSanPham_DoubleClick(object sender, EventArgs e)
        {
            GridView view = (GridView)sender;
            eSanPham sp   = (eSanPham)view.GetFocusedRow();

            if (sp != null)
            {
                int index = lstDetail.FindIndex(x => x.IDSanPham == sp.KeyID);
                if (index != -1)
                {
                    grvChiTiet.FocusedRowHandle = index;
                }
                else
                {
                    eNhapHangNhaCungCapChiTiet iDT = new eNhapHangNhaCungCapChiTiet();
                    iDT.IDSanPham    = sp.KeyID;
                    iDT.MaSanPham    = sp.Ma;
                    iDT.TenSanPham   = sp.Ten;
                    iDT.IDDonViTinh  = sp.IDDonViTinh;
                    iDT.MaDonViTinh  = sp.MaDonViTinh;
                    iDT.TenDonViTinh = sp.TenDonViTinh;
                    iDT.SoLuongLe    = 1;
                    iDT.SoLuong      = 1;
                    lstDetail.Add(iDT);
                }
            }
        }