protected void btnupdate_Click(object sender, EventArgs e)
        {
            REF_Stock oREF_Stock = new REF_Stock();
            DAC_Stock oDAC_Stock = new DAC_Stock();

            oREF_Stock.ID     = StockID;
            oREF_Stock.ItemID = ItemName.Text;
            int Qty = Convert.ToInt32(Quentity.Text) + Convert.ToInt32(newQty.Text);

            oREF_Stock.Qty = Qty.ToString();
            oDAC_Stock.Update(oREF_Stock);
            Response.Redirect("./frmStock.aspx", true);
        }