public void RemoveVariant(string variantId)
{
int count = Variants.RemoveAll(r => r.Id.Equals(variantId));
if (count == 0)
{
throw new NotFoundException(string.Format(ProductErrorMessages.PRODUCT_VARIANT_NOT_FOUND, variantId));
}
AddIntegratedEvent(ProductEventType.VARIANT_REMOVED, variantId);
Modify();
}