protected void btnSave_Click(object sender, EventArgs e)
        {
            CategoryBLL category_bll = new CategoryBLL();
            string category_name = txtCategory.Text;
            int cat_id = category_bll.AddNewCategory(category_name);

            StockItemBLL stockBll = new StockItemBLL();
            string item_Code = txtItemNo.Text;
            // int categoryID = Convert.ToInt32(txtCategory.Text);
            string description = txtDesc.Text;
            int reorder_Level = Convert.ToInt32(txtReorderLevel.Text);
            int reorder_Qty = Convert.ToInt32(txtReorderQty.Text);
            string unit = ddlUnit.SelectedItem.Text;
            int qty = Convert.ToInt32(txtQuantity.Text);

            string add_info = stockBll.AddNewStockItem(item_Code, cat_id, description, reorder_Level, reorder_Qty, unit, qty);
            lblmsg.Text = add_info;
        }