请问大神，这个错误该怎么解决？？、

这个是传值代码！
protected void dlFZ_ItemCommand(object source, DataListCommandEventArgs e)
{
string id = dlFZ.DataKeys[e.Item.ItemIndex].ToString();
this.Response.Write("<script language=javascript>window.open('showNews.aspx?id=" + id + "','','width=520,height=260')</script>");
}