private void bindPromotion()
        {
            var result = PromotionController.GetPromotion(promotion_id);

            if (result.Count > 0)
            {
                var current = result[0];
                if (current != null)
                {
                    txtPromotionCode.Text         = current.promotion_code;
                    ddlPromotonType.SelectedValue = current.promotion_type.ToString();
                    txtDiscountPercent.Text       = current.discount_percent.ToString();
                    txtDiscountValue.Text         = current.discount_value.ToString();
                    txtFreeProductId.Text         = current.free_product_id;
                    txtFreeAmount.Text            = current.free_amount.ToString();
                    txtTitle.Text         = current.title;
                    txtDesciption.Text    = current.description;
                    imgPromotion.ImageUrl = getImage(current.image);
                    imgName.Value         = current.image;

                    txtCompletePrice.Text = current.complete_price.ToString();
                }
            }
        }