private double CalculateCostValue()
        {
            double qtd = 0;
            double?standardcost;
            double baseUoMQty = 0;

            if (string.IsNullOrEmpty(txtQty.Text))
            {
                qtd = 0;
            }
            else
            {
                qtd = Convert.ToDouble(txtQty.Text);
            }

            if (string.IsNullOrEmpty(txtItem.Text))
            {
                standardcost = 0;
                baseUoMQty   = 0;
            }
            else
            {
                standardcost = Convert.ToDouble(txtStandardCost.Text);
                baseUoMQty   = itemsService.GetBaseUoMQty(txtItem.Text);
            }



            return(Math.Round((Convert.ToDouble(standardcost) / baseUoMQty) * qtd, 2));
        }