Hi guys
I have a question regarding to how to do the request validation on user's
input. We all know in asp.net. when user input something like <a>blah
blah</a> by default, It will throw a HttpRequestValidationException say "A
potentially dangerous Request.Form value was detected from the client ". And
This validation can be turned off in the page.

Now, I am quite annoy about all these exceptions cause by someone want to
post some kinds of the ads on my website. And I really do not to disable the
page request validation. The best the result for me will be I can do
something about it before it reach the request validation event, like check
the user input myself then redirect to some other pages. if user continue
doing that, the system will automatically lock user's account, and send to
an email to admin.

Is there anyway I can achieve this? Or do you have better ideas? Any help
will be appreciate?
Thanks a lot
Cheers
Victor