protected void updateGV()
{
string keyword = textbox_Search.Text;
iList = iDAO.getItemBySearch(keyword);
GridView_itemList.DataSource = iList;
GridView_itemList.DataBind();
}
public void showItemListInfo()
{
iList = iDAO.getItemList();
GridView_itemList.DataSource = iList;
GridView_itemList.DataBind();
}