Comment spam is a major annoyance for many blog sites, especially blogs that are "dofollow."

Recently, we have been getting lots of attempted spam comments from places in India and Vietnam. I dug a little deeper, and it appears that these comments all originated from the same two IP addresses.

And us much as I hate to do this, in the interest of reducing comment moderation time, we are now taking up the practice of IP blacklisting.

If this is something you are interested in exploring as an option for your ASP.net blog, I suggest starting with a great article by Mads Kristensen, entitled "Block IP addresses from your website".