protected void btnUpdate_Click(object sender, EventArgs e)
 {
     StockItemBLL stock_bll = new StockItemBLL();
     //Stock_Item item = new Stock_Item();
     string tem_Code = Session["item_code"].ToString();
     int categoryID = Convert.ToInt32(txtCategory.Text);
     string description = txtDesc.Text;
     int reorder_Level = Convert.ToInt32(txtReorder.Text);
     int reorder_Qty = Convert.ToInt32(txtReorderQty.Text);
     string unit_of_Measure = txtUnit.Text;
     int qty = Convert.ToInt32(txtQuantity.Text);
     string update_msg = stock_bll.UpdateStockItem(tem_Code, categoryID, description, reorder_Level, reorder_Qty, unit_of_Measure, qty);
     lblmsg.Text = update_msg;
 }