Asp.net--删除前提示带参数

 protected void gvquery_SelectedIndexChanging(object sender, GridViewSelectEventArgs e)//GridView控件事件
    {
        GridViewRow gvr = gvquery.Rows[e.NewSelectedIndex];
        this.lbselect.Text=gvquery.Rows[gvr.RowIndex].Cells[1].Text.Trim();
        Session["selectid"] = this.lbselect.Text.Trim();//保存用户选择的对象
        btsmdelete.Attributes["OnClick"] = "return confirm(‘确认删除" + Session["selectid"] + "员工吗？‘)";

    }