void ddlItem_DataBind(int categoryid)
        {
            StockItemBLL itembll = new StockItemBLL();

            var itemlist = itembll.GetStockItemByCategorID(categoryid);
            if (itemlist.Count != 0)
            {
                ddlItem.DataTextField = "Description";
                ddlItem.DataValueField = "Item_Code";
                ddlItem.DataSource = itemlist;
                ddlItem.DataBind();
            }
            else
            {
                ddlItem.Items.Clear();
                ddlItem.Items.Insert(0, "No Items for this Category");
            }
        }