Pop Up Window not working for clicking on Label In GridView

hi all

i ahve one GridView in that i have one Label by clicking on label  Pdf File should be open in new Pop window and its not redirecting to the specified URL...  for this i used following code..

protected void ViewInvoice(object sender, CommandEventArgs e)
        {
           int count=GvInvoice.Rows.Count;
        
               GridViewRow row = GvInvoice.Rows[1];
                Label  in_id=row.Cells[1].FindControl("lblInvoice") as Label  ;
                if(in_id!=null)
                {
            string invid=in_id.Text;
            string URL_Invoice = "~/Invoices/" + invid + ".pdf?in_id={0}";
          
                    Response.Write("<script>");
                    Response.Write("window.open('URL_Invoice','e.CommandArgument.ToString()')");
                    Response.Write("</script>");
                
           //Response.Redirect(string.Format(URL_Invoice, e.CommandArgument.ToString()));
                
                }
          
        }

Can any one suggest me Where i went Wrong