Feb 08, 2019 05:15 AM|Wei Zhang|LINK
According to your description,I don't think you could use CustomValidator to prevent SPAM. In fact ,without a captcha there is no 100% way of stopping all spam. (or even with a captcha).Spam is a problem that all website owners struggle to deal with.What
we could do is trying to reduce it.
Here are some links about how to reduce spam. I hope it could help you.