protected void ddlOrderNo_SelectedIndexChanged(object sender, EventArgs e)
    {
        if (ddlOrderNo.SelectedIndex != 0)
        {
            receivedOrderController = new ReceivedOrderController();
            int      poID      = Convert.ToInt32(ddlOrderNo.SelectedValue.ToString());
            string   supName   = receivedOrderController.getSupplierbyPOID(poID);
            DateTime date      = receivedOrderController.getOrderDate(poID);
            string   orderDate = date.ToString("dd/MM/yyyy");

            lblOrdDateDec.Visible    = true;
            lblOrdDate.Visible       = true;
            lblSupplierDes.Visible   = true;
            lblSupplierName.Visible  = true;
            lblDONo.Visible          = true;
            txtDeliveryOrdNo.Visible = true;
            lblSupplierName.Text     = supName;
            lblOrdDate.Text          = orderDate;
            //GdvReceivedOrder.DataSource = receivedOrderController.getListDataTable(poID);
            //GdvReceivedOrder.DataBind();
            //ViewState["CurrentData"] = receivedOrderController.getListDataTable(poID);
            //GdvReceivedOrder.DataBind();
            btnSave.Visible = false;
            btnShow.Visible = false;
        }
        else
        {
            ClearGridView();
            btnSave.Visible = false;
            btnShow.Visible = false;
        }
    }
    protected void btnShow_Click(object sender, EventArgs e)
    {
        if (Page.IsValid)
        {
            receivedOrderController = new ReceivedOrderController();
            int      poID      = Convert.ToInt32(ddlOrderNo.SelectedValue.ToString());
            string   supName   = receivedOrderController.getSupplierbyPOID(poID);
            DateTime date      = receivedOrderController.getOrderDate(poID);
            string   orderDate = date.ToString("dd/MM/yyyy");

            lblOrdDateDec.Visible    = true;
            lblOrdDate.Visible       = true;
            lblSupplierDes.Visible   = true;
            lblSupplierName.Visible  = true;
            lblDONo.Visible          = true;
            txtDeliveryOrdNo.Visible = true;
            btnSave.Visible          = true;


            lblSupplierName.Text        = supName;
            lblOrdDate.Text             = orderDate;
            GdvReceivedOrder.DataSource = receivedOrderController.getListDataTable(poID);
            GdvReceivedOrder.DataBind();
            ViewState["CurrentData"] = receivedOrderController.getListDataTable(poID);
            GdvReceivedOrder.DataBind();
            btnSave.Visible = true;
        }
    }