protected void gvProductSpecificationAttributes_RowDeleting(object sender, GridViewDeleteEventArgs e)
        {
            int productSpecificationAttributeId = (int)gvProductSpecificationAttributes.DataKeys[e.RowIndex]["ProductSpecificationAttributeId"];
            ProductSpecificationAttribute productSpecificationAttribute = SpecificationAttributeManager.GetProductSpecificationAttributeById(productSpecificationAttributeId);

            if (productSpecificationAttribute != null)
            {
                SpecificationAttributeManager.DeleteProductSpecificationAttribute(productSpecificationAttribute.ProductSpecificationAttributeId);
                BindData();
            }
        }