protected void gdvSecondLevel_RowCommand(object sender, GridViewCommandEventArgs e)
 {
     if (e.CommandName.Equals("delSecondLevel"))
     {
         int id = Convert.ToInt32(e.CommandArgument);
         if (LabelHelper.removeItem(id, "secondLevel"))
         {
             Response.Write(JSHelper.alert("删除成功!", "manageLabel.aspx"));
         }
         else
         {
             Response.Write(JSHelper.alert("删除失败,请重试!"));
         }
     }
 }