page not redirecting to new page

Question

when i click orders in DataGrid page is not transfering to order.aspx.

private void DataGrid1_ItemCommand(object source, DataGridCommandEventArgs e)
        {
            if (e.CommandName == "ORD")
            {
                string strISBN;
                string strTitle;
                string strAuthor;
                strISBN = e.Item.Cells[1].Text;
                strTitle = e.Item.Cells[2].Text;
                strAuthor = e.Item.Cells[3].Text;

                Response.Redirect("order.aspx?ISBN=" + strISBN + "@ Title=" + strTitle + "@ Author=" + strAuthor);
            }
        }

can someone help with this.
Thanks in advance.